How does an elements period number related to the number of the energy level of its valence electrons?

Answers

Answer 1
There is a direct correlation between the period number and the energy level for valence electrons. For example, the H and He elements, in period 1, have their outer electrons in the energy level "1". This continues down the rows: all the elements in period 2 have their principal energy level as n = 2, period 3 has n = 3, and so on.

Related Questions

Organic compounds are covalently bonded and they always contain oxygen true or false

Answers

Fale, they alwayd cotain carbon.

Hope this helps

An atom of copper is represented by 6529cu. how many neutrons are in the nucleus of this atom?

Answers

An atom of copper is represented by  ⁶⁵₂₉Cu and to find the number of neutrons:
number of neutrons = 65 - 29 = 36
The mass of an atom is equal to the number of neutrons and protons in the nucleus.
65 represents the mass of Cu and 29 represents the number of protons.
so the number of neutrons is 36.

the grams of carbohydrate in one apple if the apple has no fat and no protein and provides 72 kcal of energy

Answers

Carbohydrates have 4 kcal per gram of carbohydrates. (Protein is also 4 kcal/gram, while fat is 9 kcal/gram). Take the total kcal and divide by 4 kcal/gram: 72 kcal/(4 kcal/gram) = 18 grams carbohydrates.

Which of these statements are consistent with kinetic-molecular theory? Select all that apply.
a. The molecules in water at 100°C have more kinetic energy than the molecules in water at 0°C.
b. As a solid is heated, its particles absorb thermal energy and move more slowly.
c. The carbon atoms in a diamond vibrate back and forth in place.
d. The particles of matter in the sun are in constant random motion.
e. If you superheat a gas, its particles eventually stop moving completely.

Answers

The Kinetic Molecular Theory focuses on the average kinetic energy of the molecules with respect to temperature. As the absolute temperature increases, the kinetic energy also increases. Same is true for the opposite situation. The kinetic energy is manifested by rapid collisions. Thus, the answers are A, C and D.

The statements that are consistent with kinetic-molecular theory includes:

the molecules in water at 100°C have more kinetic energy than the molecules in water at 0°C.the carbon atoms in a diamond vibrate back and forth in place.the particles of matter in the sun are in constant random motion.

The theory of Kinetic Molecular focuses on the average kinetic energy of the molecules with respect to temperature.

The theory explains that the absolute temperature increases, the kinetic energy also increases.

Therefore, the Option A, C and D is correct.

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Is taking a glass of water and freezing it by placing in the freezer chemical change?

Answers

Technically, no because you are not changing the chemical make up of water when you freeze it, you are only changing the state. (liquid to solid)

The reaction between aluminum and iron(iii) oxide can generate temperatures approaching 3000°c and is used in welding metals: 2al + fe2o3 → al2o3 +2fe in one process, 149 g of al are reacted with 601 g of fe2o3. calculate the mass (in grams) of al2o3 formed, and determine the amount of excess reagent left at the end of the reaction.

Answers

Final answer:

In the reaction of 2Al and Fe2O3, 7.56 moles of Al reacted with 3.76 moles of Fe2O3. 385.4 g of Al2O3 were formed, and there was no excess Fe2O3 reagent left.

Explanation:

In this chemistry problem, we must use stoichiometry to determine the mass of the product and the amount of excess reagent. First, balance the equation: 2Al + Fe2O3 → Al2O3 +2Fe. From the equation, we can determine the stoichiometric relationship which is 2 mol of Al react with 1 mol of Fe2O3 to produce 1 mol of Al2O3.

Moles of Al = mass/molar mass = 204.19/26.98 = 7.56 moles. Moles of Fe2O3 = mass/molar mass =601/159.69 = 3.76 moles. As per the stoichiometric relationship, Al will be the limiting reagent and Fe2O3 will be in excess.

Using the limiting reagent, we can calculate the mass of Al2O3 formed: moles of Al2O3 = moles of Al/2 = 7.56/2 = 3.78 mol. So, mass = moles x molar mass = 3.78 x 101.96 = 385.4g.

To find the number of moles of Fe2O3 used, we divide the moles of Al by 2: 3.78 moles. The excess reagent left = initial moles – used moles = 3.76 – 3.78 = -0.02moles. Because no reagent can be left in negative amount, the excess Fe2O3 is 0.

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Final answer:

The mass of Al₂O₃ formed and the excess reactant after the reaction can be calculated by identifying the limiting reactant and calculating the theoretical yield of the reaction. Finally, the amount of reactant used is subtracted from the initial amount for the excess reactant.

Explanation:

The thermite reaction between aluminum (Al) and iron(III) oxide (Fe₂O₃) produces aluminum oxide (Al₂O₃) and iron (Fe). Given the balanced thermochemical equation for the reaction: 2Al + Fe₂O₃ → Al₂O₃ + 2Fe, we can calculate the stoichiometry to find the amount of Al₂O₃ formed and the excess reagent left over.

First, we calculate the molar mass of Al, Fe₂O₃, and Al₂O₃ and then calculate the number of moles of Al and Fe₂O₃ in the given masses. Then we identify the limiting reactant in the reaction, which is the reactant that gets completely used up in the reaction determining the maximum amount of product that can be formed. Next, we determine the theoretical yield, the amount of Al₂O₃ that would be formed if the reaction went to completion. Finally, we subtract the amount reacted from the initial amount to determine the excess reagent.

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What is the empirical formula of the phosphorus selenide?

Answers

atomic mass of phosphorous = 31g atomic mass of selenium = 79g 45.2/31 = 1.45 which is nearly 1.5 mol of P 131.6 - 45.2 = 86.4g 86.4/79 =1.09 which is nearly 1 mol of Se So the empirical formula of the phosphorus selenide is: P3Se2

Final answer:

The empirical formula of phosphorus selenide is represented as P₂Sen, where 'n' is the number of selenium atoms bonded to two phosphorus atoms. Specific stoichiometry is needed for an exact formula.

Explanation:

The empirical formula of a compound represents the simplest whole-number ratio of the elements within that compound. For phosphorus selenide, we need to look at the actual stoichiometry of the compound to determine its empirical formula. Without specific information on the stoichiometry, we cannot give an exact empirical formula. However, some known phosphorus selenides include P₂Se₃ and P₂Se. To generalize, an empirical formula for phosphorus selenide could be P₂Sen, where 'n' represents the number of selenium atoms that bond with two phosphorus atoms.

The lowest temperature at which a flammable liquid gives off enough vapor to form an ignitable mixture in air describes or defines its

Answers

the flash point is the lowest temperature at which a flammable liquid gives off enough vapor to ignite.

Answer:  Flash Point

Explanation:  Volatile substance is the substance which can easily catch fires.

Thus, there must be a point to define that temperature when the volatile substance catches fire given enough source of flame. This point is known as Flash Point.

Thus, Flash point is defined as the lowest temperature at which the flammable or volatile liquid catches fire and convert itself into the ignitable mixture when enough source of ignition is given.

Question 12solid sodium and chlorine gas combine to form solid sodium chloride .write a balanced chemical equation for this reaction.

Answers

2Na(s) + Cl₂(g) ---> 2 NaCl(s)
:)

which property determines how well a solid resists breaking? strength hardness stress strain

Answers

In this case, I believe that toughness would be the correct answer.

If 45.3 grams of aluminum react with an excess of oxygen, as shown in the balanced chemical equation below, how many grams of aluminum oxide can be formed? Please show all your work for the calculations for full credit.

4Al + 3O2 yields 2Al2O3

Answers

Mole of al=mass/mr
=45.3/27=1.6777
Mole of al2o3=2/4* moles of al
1.67777*2=mass/mr
Mass of al2o3=1.67777*2*(27*2+16*3)=342 g

Answer:

86g of [tex]Al_{2}O_{3}[/tex]

Explanation:

1. The balanced chemical equation is:

[tex]_{4}Al+_{3}O_{2}=_{2}Al_{2}O_{3}[/tex]

2. Use the stoichiometry of the reaction to calculate how many moles of aluminum oxide can be formed.

If the oxygen is in excess it means that the aluminum is the limiting reagent and the calculations must be made using the mass of aluminum.

[tex]45.3gAl*\frac{1molAl}{27gAl}*\frac{2molesAl_{2}O_{3}}{4molesAl}=0.84molesAl_{2}O_{3}[/tex]

3. Use the molar mass of the [tex]Al_{2}O_{3}[/tex] to calculate how many grams of aluminum oxide can be formed:

[tex]0.84molesAl_{2}O_{3}*\frac{102gAl_{2}O_{3}}{1molAl_{2}O_{3}}=86gAl_{2}O_{3}[/tex]

The secondary structure of a protein results from _____. the secondary structure of a protein results from _____. bonds between sulfur atoms hydrophobic interactions peptide bonds hydrogen bonds ionic bonds

Answers

Final answer:

The secondary structure of a protein is determined by hydrogen bonds between amino acids in different regions of the polypeptide chain.

Explanation:

The secondary structure of a protein results from hydrogen bonds between amino acids in different regions of the polypeptide chain. This folding can take the form of an alpha-helix or a beta-pleated sheet. Hydrogen bonds form between the oxygen atom in the carbonyl group of one amino acid and the amino acid that is four amino acids farther along the chain.

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According to Boyle's law, the relationship between the pressure and volume of a gas at constant temperature is —


numerically equivalent.


inversely proportional.


positively correlated.


totally unrelated.

Answers

the answer is inversely proportional. As one goes up the other goes down. Hope it helps! 

a group of students wants to see how temperature affects the time it takes for spilled water to dry up in the investigation what will be the dependent and independent variables

Answers

The independent variable is the one that researchers directly change. Here, the students will deliberately change the temperature, so the independent variable will be temperature in degrees. The dependent variable is the one that researchers measure as the outcome of the experiment. Here, the students will measure the time it takes until the water is gone (evaporated), so the dependent variable will be time, in units of seconds or minutes or hours.

A 10.63 g sample of mo2o3(s) is converted completely to another molybdenum oxide by adding oxygen. the new oxide has a mass of 11.340 g. add subscripts below to correctly identify the empirical formula of the new oxide.

Answers

The empirical formula of the new oxide is MoO₃.

1) Find the number of moles of Mo₂O₃: n= mass/Mwt=(18.75)/(239.9)=0.0782 mol of Mo₂O₃ 2)

Find the number of moles of Mo in Mo₂O₃: 1 mol Mo2O3 --> 2 moles of Mo

0.0782 mol of Mo₂O₃ --> X moles of Mo X = (2×0.0782)/1

=0.156 mol of Mo

In the first oxide (it would be the same for the second oxide “see step 3”) 3) The mass of Mo in the second oxide doesn’t change (because the question said that oxygen has been added “only”, therefore, the mass of Mo in the first oxide = the mass of Mo

in the second oxide: Mass of Mo = n x Mwt of Mo

= 0.156 x 95.95

= 14.97 grams.

4) Find the mass of oxygen in the second oxide: mass of the second oxide = mass of Mo + mass of O

 Mass of O = Mass of the second oxide – Mass of Mo

= 22.50 – 14.97

= 7.53 grams

5) Find the empirical formula by finding their number of moles first, then divide it by the smallest number of moles:

mass of Mo = 14.97 grams --> moles of Mo

= 0.156 mol of Mo

mass of O = 7.53 grams

moles of O = 0.471 mol of O

Divide by the smallest number of moles (by 0.156)

Therefore, the new empirical formula is MoO₃.

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The empirical formula of the new oxide is MoO₄.

To identify the empirical formula of the new oxide, we need to calculate the number of moles of molybdenum and oxygen in the new oxide.

Moles of molybdenum:

Moles of molybdenum = 11.340 g / 95.94 g/mol = 0.118 mol

Moles of oxygen:

Moles of oxygen = (11.340 g - 10.63 g) / 16.00 g/mol = 0.0436 mol

Empirical formula:

The empirical formula of the new oxide is MoO_{x}, where x is the number of moles of oxygen per mole of molybdenum. We can calculate x by dividing the moles of oxygen by the moles of molybdenum:

x = 0.0436 mol / 0.118 mol = 0.370

Rounding to the nearest integer, we get x = 4. Therefore, the empirical formula of the new oxide is MoO₄.

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The atmosphere of the gas giants is usually made up mostly of hydrogen and ______.

Answers

Answer: Helium

Explanation:

what are the advantages and disadvantages to using an isometric pictorial compared to oblique pictorial in technical drawings

Answers

A pictorial drawing represents three sides of an object in a view. An isometric pictorial is a type of pictorial drawing which is built on three lines called isometric axes.Oblique pictorial on the other hand is used to produce two dimensional images of three dimensional objects. 
 Isometric pictorial are usually drawn on pictorial line sheets, this makes things easier when it comes to sketching pictorial drawings. But in using pictorial line sheets one has to determine the direction at which the edge will  be located and the depth that will be befitting for the drawing.
Oblique pictorial use vanish point, which guide the drawer in his drawing, but he has to make some estimations in order to draw a good oblique diagram.

How many gallons of water in lake lewisville?

Answers

1.422 × 10^11 us liquid gallons
Final answer:

Lake Lewisville typically contains more than 142 billion gallons of water at its normal elevation, calculated by multiplying its storage volume of approximately 436,000 acre-feet by the gallons-per-acre-foot conversion factor.

Explanation:

The student has asked about the volume of water in Lake Lewisville. Unfortunately, the exact amount of water in Lake Lewisville can vary due to several factors, including seasonal rainfall, water usage, and conservation efforts. However, it's known that the lake has a normal storage volume of approximately 436,000 acre-feet at its normal elevation of 522 feet above mean sea level according to official data. Since one acre-foot is equal to about 325,851 gallons of water, by multiplying the acre-feet by this conversion factor, it can be estimated that Lake Lewisville typically holds more than 142 billion gallons of water when at normal levels.

Per gram, fats release three times the energy releases from proteins.

Answers

Fats release more energy per gram that proteins. when burned a gram of fat releases 9 calories, while one gram of protein releases about 4 calories. Fats release about twice as much energy per gram than protein. Proteins are essential in numerous body functions and processes so this molecule is not usually metabolized for energy. 

Why are roman numerals used in naming compounds that contain transition metals?

Answers

because we've been already using Arabic numerals to show thw no. of element , oxidation number, charges etc. so the scientists decided to use roman numeral in the name of Gailus Plinius Secundus.

What type of chemical bond holds the na+ and cl- ions together in table salt?

Answers

The bond between Na + and Cl- ions is an ionic bond

To achieve stability, atoms with low ionization energy such as Na atoms will release electrons and bind to atoms with high-affinity energy such as Cl atoms

[tex]\boxed{\boxed{\bold{Further~explanation}}}[/tex]

Atoms have different stability. Unstable atomic atoms will try to form stable electron configurations like those of noble gases. Where noble gases have the number of outer electrons 2 or 8

The formation of electron configurations such as noble gases can be done by forming shared ions or electron pairs

Atoms with high ionization energy and atoms that are difficult to draw electrons will form bonds with shared electron pairs (electrons can be from one atom or two atoms attached)

In forming ions, atoms will release or attract electrons

Ion bonds occur because atoms that have low ionization energy (easily release electrons) form a + ion, and these electrons are bound by atoms that have large affinity energy (easily pulling electrons)

Generally, ionic bonds occur in metal and nonmetallic elements. Metal elements have low ionization energy and non-metallic elements have a high electron affinity

In Na atoms, to achieve stability, Na will release one electron so that it has an electron configuration like noble gas Ne

Na: 2 8 1

Ne: 2 8

so that it becomes a Na + ion

While the Cl atom will bind one electron, so it has an electron configuration like noble gas Ar

Cl: 2 8 7

Ar: 2 8 8

So that it becomes a Cl- ion

Finally, there will be an attractive attraction between positive ions and negative ions and NaCl is formed

So the bond between Na + and Cl- ions is an ionic bond

[tex]\boxed{\boxed{\bold{Learn~more}}}[/tex]

the octet rule

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Keywords: ionic and covalent bonds, the octet rule, noble gases, electron configurations

[tex]\boxed{{\text{Ionic bond}}}[/tex] holds [tex]{\text{N}}{{\text{a}}^ + }[/tex] and [tex]{\text{C}}{{\text{l}}^ - }[/tex] together in table salt.

Further Explanation:

Chemical bond:

The attraction between atoms, molecules or ions which results in the formation of chemical compounds is known as a chemical bond. It is formed either due to electrostatic forces or by the sharing of electrons. There are many strong bonds such as ionic bonds, covalent bonds, and metallic bonds while some weak bonds like dipole-dipole interactions, London dispersion forces, and hydrogen bonding.

Ionic compound:

Ionic compounds are the compounds that are formed from the ions of the respective species. Ions are the species that are formed either due to loss or gain of electrons. A neutral atom forms cation by the loss of electrons and anion by the gain of electrons.

Following are some of the properties of ionic compounds:

1. These are hard solids.

2. High melting and boiling points.

3. Good conductors of heat and electricity.

4. High enthalpy of fusion.

Sodium (Na) is a metal while chlorine (Cl) is a non-metal. So Na loses one of its valence electrons by virtue of its low ionization enthalpy and [tex]{\text{N}}{{\text{a}}^ + }[/tex] is formed. Due to high electronegativity of chlorine, Cl gains an electron and forms [tex]{\text{C}}{{\text{l}}^ - }[/tex] . The electrostatic attraction between [tex]{\text{N}}{{\text{a}}^ + }[/tex] and [tex]{\text{C}}{{\text{l}}^ - }[/tex] results in the formation of ionic bond between them and thus NaCl is an ionic compound. (Refer to the attached image)

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: Na+, Cl-, table salt, chemical bond, ionic bond, anion, cation, attraction, electrostatic forces, mutual sharing of electrons, gain, loss, electrons, metal, non-metal, Na, Cl, sodium, chlorine.

astronauts brought back 500 lb rock samples from the moon. how many kilograms did they bring back (1 kg = 2.20 lbs)

Answers

Astronauts brought back 500 lb of rock samples from the moon. How many kilograms did they bring back? (1 kg = 2.20 lb)

A. 500 kg

B. 1,100 kg

C. 498 kg

D. 227 kg


I believe it is D.

Astronauts brought back 500 lbs rock samples from the moon they brought back 227 kilograms of sample. The correct option is D.

Who are astronauts?

An astronaut is characterized as "a person who travels further than the Earth's atmosphere" or "a spaceflight trainee."

The ultimate goal of getting into space is to work and live there, just as the eventual aim of exploring the New World was colonization, rather than simply sitting back on Earth and thinking about what automated spacecraft report back.

It's one of the most difficult jobs to obtain in the world. Even if you are chosen to be an astronaut, you are not pretty much assured a trip to space.

Hundreds of humans have traveled to space, but many of those chosen as "astronauts" never made it.

As the astronaut brought 550 lbs sample,

2.20lbs = 1 kg.1 lbs = 1/2.201 lbs = 0.45so, 500 lbs nearly implies 227kgs.

Thus, the correct option is D.

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Your question seems incomplete, the missing options are:

A. 500 kg

B. 1,100 kg

C. 498 kg

D. 227 kg

Nicotine, a component of tobacco, is composed of c, h, and n. a 4.725 −mg sample of nicotine was combusted, producing 12.818 mg of co2 and 3.675 mg of h2o. what is the empirical formula for nicotine?

Answers

C = 12.818 mg CO2 (1 mmol CO2/44 mg CO2) (1 mmol C/1 mmol CO2) = 0.29 mmol

H = 3.675 mg of H2O (1 mmol H2O/18 mg H2O) (2 mmol H/1 mmol H2O) = 0.41 mmol

N = (4.725 mg – 0.29 * 12 – 0.41 * 1) * (1 mmol/14 mg) = 0.06 mmol

Divide everything by the smallest number:

C = 0.29/0.06 = 4.8 ~ 5

H = 0.41/0.06 = 6.8 ~  7

N = 0.06/0.06 = 1

 

Empirical formula is:

C5H7N

A stack of books are sitting on the table. Which force is pulling it down ? A. Buoyant force B. Pressure force C. Gravitational force

Answers

C. gravitational force

There is a gravitational force pulling the stack of books downward. Gravity is always a factor on earth. Keep that in mind when asked these sort of questions. They are made to confuse you. Take your time and you will do just fine.

Hydrogen has three naturally occurring isotopes which figure into the average atomic mass found on the periodic table (1.00974): hydrogen-1, hydrogen-2, and hydrogen-3. Which would you guess is most abundant? Explain your answer

Answers

The most abundant isotope is the isotope with the mass number the closest to the average atomic mass.

A mixture of n2(g) and h2(g) reacts in a closed container to form ammonia, nh3(g). the reaction ceases before either reactant has been totally consumed. at this stage 1.0 mol n2, 1.0 mol h2, and 1.0 mol nh3 are present. part a how many moles of n2 and h2 were present originally?

Answers

The amount of [tex]{{\text{N}}_2}[/tex]  initially taken is [tex]\boxed{{\text{1}}{\text{.5 mol}}}[/tex] and the amount of [tex]{{\text{H}}_2}[/tex]  initially taken is  [tex]\boxed{{\text{2}}{\text{.5 mol}}}[/tex].

Further explanation:

Stoichiometry of a reaction is used to determine the amount of species present in the reaction by the relationship between the reactants and products. It can be used to determine the moles of a chemical species when the moles of other chemical species present in the reaction is given.

Consider the general reaction,

 [tex]{\text{A}}+2{\text{B}}\to3{\text{C}}[/tex]

Here,

A and B are reactants.

C is the product.

One mole of A reacts with two moles of B to produce three moles of C. The stoichiometric ratio between A and B is 1:2, the stoichiometric ratio between A and C is 1:3 and the stoichiometric ratio between B and C is 2:3.

The balanced chemical equation for the formation of [tex]{\text{N}}{{\text{H}}_3}[/tex]  is as follows:

[tex]{{\text{N}}_2}\left(g\right)+3{{\text{H}}_2}\left(g\right)\to2{\text{N}}{{\text{H}}_3}\left(g\right)[/tex]

The balanced chemical equation shows that 1 mole of [tex]{{\text{N}}_2}[/tex]  and 3 moles of [tex]{{\text{H}}_2}[/tex]  reacts to form 2 moles of [tex]{\mathbf{N}}{{\mathbf{H}}_{\mathbf{3}}}[/tex] .

In the question, reaction started with the unknown quantity of reactant [tex]{{\text{N}}_2}[/tex]  and [tex]{{\text{H}}_2}[/tex] and stopped when 1.0 mol ammonia was produced. Also, reactants left in the reaction mixture are 1.0 mol of [tex]{{\text{H}}_2}[/tex]  and 1.0 mol of [tex]{{\text{N}}_2}[/tex] .

According to the balance reaction 2 moles of ammonia is produced by the 3 moles of [tex]{{\text{H}}_2}[/tex] . Thus amount of hydrogen molecule required to produce 1 mole of ammonia is,

[tex]\begin{gathered}{\text{Moles of }}{{\text{H}}_2}=\frac{{3{\text{ mol }}{{\text{H}}_2}}}{{2{\text{ mol N}}{{\text{H}}_3}}}\times1{\text{ mol N}}{{\text{H}}_3}\\=1.5{\text{ mol }}{{\text{H}}_{\text{2}}}\\\end{gathered}[/tex]

According to the balance reaction 2 moles of ammonia is produced by the 1 mole of [tex]{{\text{N}}_2}[/tex] . Thus the amount of [tex]{{\text{N}}_2}[/tex] molecule required to produce 1 mole of ammonia is,

[tex]\begin{gathered}{\text{Moles of }}{{\text{N}}_2}=\frac{{1{\text{ mol }}{{\text{N}}_2}}}{{2{\text{ mol N}}{{\text{H}}_3}}}\times1{\text{ mol N}}{{\text{H}}_3}\\=0.5{\text{ mol }}{{\text{N}}_2}\\\end{gathered}[/tex]

Therefore, the amount of [tex]{{\text{N}}_2}[/tex]  and [tex]{{\text{H}}_2}[/tex]  are consumed until the reaction is stopped is 0.5 moles and 1.5 moles respectively.

Therefore, the amount of [tex]{{\text{N}}_2}[/tex]  initially taken is,

[tex]\begin{aligned}{\text{Amount of }}{{\text{N}}_2}&=\left({1.0 + 0.5}\right){\text{ mol}}\\&=1.5{\text{ mol}}\\\end{aligned}[/tex]

The amount of [tex]{{\text{H}}_2}[/tex]  initially taken is,

[tex]\begin{aligned}{\text{Amount of }}{{\text{H}}_2}&=\left({1.0 + 1.5}\right){\text{ mol}}\\&=2.5{\text{ mol}}\\\end{aligned}[/tex]

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole concept

Keywords: N2, H2, NH3, 3H2, 2NH3, limiting reagent, nitrogen, hydrogen, ammonia, 0.5 mol, 1.0 mol, 1.5 mol, 2.5 mol, 1.0 mol of NH3.

The number of moles of N2 and H2 that were originally present are;

N2 = 1.5 mol

N2 = 1.5 molH2 = 2.5 mol

We are told that N2(g) reacts with H2(g) to form ammonia NH3(g).

This reaction when balanced is;

N2(g) + 3H2(g) = 2NH3(g)

Now, we are told that the reaction ceases before the reactants are totally consumed and that there was 1 mole of ammonia present. This means we have to simplify our balanced equation so that the number of moles attached to Ammonia(NH3) can be 1.

Thus,divide each of the number of moles in the balanced equation by 2 to get;

0.5N2(g) + 1.5H2(g) = NH3(g)

We are told that the number of moles of N2 and H2 that were present at the stage after the reaction had ceased was;

1 mol of N2 and 1 mol of H2.

Thus;

Number of moles of N2 originally present = 1 + 0.5 = 1.5 moles

Number of moles of H2 originally present = 1 + 1.5 = 2.5 moles

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Mole-Mass Conversions
How many moles in 28.o grams of Oxygen?




What is the mass of 5.0 moles of Iron?




Find the number of moles of argon in 452 g of argon.





Find the grams in 16.5 mol of Hydrogen.

Answers

1.) 28.0 grams of oxygen
28 grams (1 mole/16 grams per mole)=1.75 moles oxygen
2.)5.0 moles of Iron
5 moles(55.845 grams/1 mole)=279.225 grams Iron
3.) 452 grams Argon
452 grams(1 mole/39.948 grams)=11.315 moles Argon
4.) 16.5 moles Hydrogen
16.5 moles(1.01 grams/1 mole)=16.665 grams Hydrogen

Final answer:

To find the number of moles in a given mass of a substance, divide the mass by the molar mass. To find the mass of a given number of moles of a substance, multiply the number of moles by the molar mass.

Explanation:

To find the number of moles in a given mass of a substance, we use the formula:

moles = mass / molar mass

For example:

1. To find the number of moles in 28.0 grams of oxygen:

moles = 28.0 g / 32.00 g/mol (molar mass of oxygen)

moles = 0.875 mol

2. To find the mass of 5.0 moles of iron:

mass = 5.0 mol * 55.85 g/mol (molar mass of iron)

mass = 279.25 g

3. To find the number of moles of argon in 452 g of argon:

moles = 452 g / 39.95 g/mol (molar mass of argon)

moles = 11.31 mol

4. To find the grams in 16.5 mol of hydrogen:

mass = 16.5 mol * 1.01 g/mol (molar mass of hydrogen)

mass = 16.665 g

Why is a claim supported by a great variety of data more trustworthy than a claim made by an individual person?

Answers

One person's opinion is not enough to make a claim trustworthy, because that may not be how many people see it. It is better to get a lot of people's claims (including some prestigious people's when it comes to the topic) to make your argument strong

hope this helps

How many more valence electrons does carbon need to be a full outer valence shell?

Answers

4 because it's electron configuration is 1s2 2s2 2p2 and to have a full outer valence shell you need 2p6 so you only need 4 more electrons to get to 2p6.

What celsius temperature, t2, is required to change the volume of the gas sample in part a (t1 = 43 ∘c , v1= 1.13×103 l ) to a volume of 2.26×103 l ? assume no change in pressure or the amount of gas in the balloon?

Answers

Final answer:

The Celsius temperature required to change the volume of the gas sample to a specific volume at constant pressure can be found using Charles's Law. In this case, the temperature, volume, and initial conditions are given, allowing us to solve for the unknown temperature. By substituting the values into the formula, we find that the required temperature is 316 K.

Explanation:

A volume change caused by a temperature change at constant pressure means we should use Charles's law. Taking V₁ and T₁ as the initial values, T2 as the temperature at which the volume is unknown and V₂ as the unknown volume, and converting °C into K we have:

T₂ = (T₁ * V₂) / V₁

Substituting the given values:

T₂ = (43 + 273) * (2.26 × 10³) / (1.13 × 10³)

T₂ = 316 K

Learn more about Charles's Law here:

https://brainly.com/question/16927784

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To change the gas volume from 1.13×10³ L at 43°C to 2.26×10³ L, the required temperature is 359°C. This is calculated using Charles's Law and converting temperatures between Celsius and Kelvin.

Calculating the Required Temperature Using Charles's Law

To solve this, we will use Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure and the amount of gas are constant. The formula for Charles's Law is:

V₁ / T₁ = V₂ / T₂

First, we convert the temperatures from Celsius to Kelvin:

T₁ = 43°C + 273 = 316 K

Next, we rearrange Charles's Law to solve for T₂:

T₂ = (V₂ × T₁) / V₁

Substitute the known values into the equation:

T₂ = (2.26×10³ L × 316 K) / 1.13×10³ L

T₂ = 632 K

Finally, convert the temperature from Kelvin back to Celsius:

T₂ = 632 K - 273 = 359°C

Thus, the required temperature t₂ is 359°C.

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