1. In the chemical equation above, name the reactant(s)
and product(s).

Answer:

Acids when dissolved in water produce hydrogen ions.

Explanation:

Answer:

Supersaturated

Explanation:

Let's define the types of solutions in the context of this problem firstly:

We need to use a solubility curve for salts given below. Notice that the intersection in the y-axis at [tex]40^oC[/tex] is at about 14 g. This means a saturated solution would be obtained if 14 g of [tex]KClO_3[/tex] were dissolved in 100 g of water at this temperature. Anything above it would yield a supersaturated solution, below – an unsaturated solution.

Hence, we have a supersaturated solution.

1. Meteorologist predict the weather by using tools. They use these tools to measure atmospheric conditions that occurred in the past and present, and they apply this information to create educated guesses about the future weather. The best we can do is observe past and present atmospheric patterns and data, and apply this information to what we think will happen in the future. Meteorologists use the scientific method on a daily – and even hourly – basis!

2. They use thermometers, barometers, sling psychrometers and rain gauges. They also use anemometers, hygrometers, weather maps, weather balloons and weather satellites.

Final answer:

Meteorologists make weather predictions by using weather stations and radar to gather data and analyze patterns in the atmosphere.

Explanation:

Meteorologists make weather predictions by using various tools to gather data and analyze patterns in the atmosphere.

Two types of weather tools commonly used by meteorologists are:

Weather stations: These are equipped with instruments such as barometers to measure air pressure, thermometers to measure temperature, and anemometers to measure wind speed and direction.

Radar: Weather radar uses radio waves to detect precipitation and track its movement. This information is crucial for predicting the path and intensity of storms.

By collecting data from these tools and analyzing it, meteorologists can make accurate weather predictions.

Answer:

Advantages: More land has been made available for development. More buildings and infrastructure can be built, and also for other reasons.

Disadvantages: Much greenery has been removed in order for the land needed. Land reclamation can be damaging to corals and marine life. Corals are usually moved to another place when land is to be reclaimed. The corals might not be able to survive in that certain habitat, and thus die out. In some countries, where the project is large-scale, they do not even bother to re-plant the corals elsewhere, instead just reclaim the land on their habitat, causing them to die out immediately. Marine life, such as fishes, might not have enough food after the underwater plantations are destroyed due to reclamation of land. This applies to the food chain. The waters might also be polluted from the soil used to reclaim land, causing the fishes to die and blocking out sunlight, depriving the underwater plants of growth. Marine habitats are also destroyed, as mentioned earlier; therefore, the marine creatures would be forced to move to another new habitat. Some might not be able to adapt, and thus die out. Some would just die without even finding a new habitat, as they cannot move long distances in water. Of course, the reasons and examples look tempting to us humans, but marine life is life too! We should try to protect is as much as possible, instead of just focusing on the advantages.

Answer:

Diffusion occurs in solid and liquid through the constant and random motion of the smaller particles called molecules of either solid, liquid or gaseous in permeable medium as witnessed in the experiment.

Explanation:

The kinectic molecular theory of matter states that the smaller particles of matters called molecules are in constant, but random motion and the degree of movement of the molecules depends on the state or phase such matter exist, which is a derivative of the total kinetic energy possessed by the molecules. This average kinetic energy of the molecules as iodine for example is proportional to the temperature of the matter.

Diffusion should be remembered as the movement of molecules of matters from a highly concentrated region otherwise called hypertonic region to a less concentrated region called hypotonic region through a permeable medium until there is an equilibrium in the system. Since diffusion is expected to involve the movement of molecules, and any matter that can exhibit diffusion is said to have moving molecules, therefore, the kinetic molecular theory of matter is proven to be accurate with the observed movement of iodine molecules in the test tube. This shows that even the molecules of solid matters are in constant random motion, this is made more convincing when these molecules migrate without the addition of external energy source like heat, which then help to understand that the natural iodine molecules are in constant random motion, as they are changed to gaseous state without passing through liquid state, a phenomenon called sublimation.

Zn    +  Cu²⁺   →    Zn²⁺ +  Cu

Explanation:

The overall equation of this redox reaction is combination of the two half equations. The similar species on both sides are cancelled out leaving a net overall reaction:

           Zn → Zn²⁺  +  2e⁻      oxidation step

           Cu²⁺ + 2e⁻ → Cu        reduction step

Combining both equations:

Zn + Cu²⁺ + 2e⁻  → Zn²⁺  +  2e⁻  + Cu

since the common specie on both sides is  2e⁻, they cancel out to give an overall reaction:

                      Zn    +  Cu²⁺   →    Zn²⁺ +  Cu

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Final answer:

The overall equation for the displacement reaction where zinc replaces copper is Zn(s) + Cu2+ (aq) → Zn2+ (aq) + Cu(s).

Explanation:

The question concerns the determination of the overall chemical reaction for a displacement reaction where zinc displaces copper from its solution. Starting from the half-reactions, the oxidation half-reaction is Zn(s) → Zn2+(aq) + 2e-, which indicates zinc is being oxidized by losing electrons. The reduction half-reaction for copper is Cu2+(aq) + 2e- → Cu(s), showing that copper ions are being reduced by gaining electrons. When we combine these two half-reactions, we must ensure that the electrons lost by zinc equal the electrons gained by copper to balance the reaction. Thus, the overall reaction is Zn(s) + Cu2+ (aq) → Zn2+ (aq) + Cu(s). This equation represents a single displacement reaction where zinc metal is transformed into its ionic form and copper ions are deposited as copper metal.

Answer:

The first question is 4

The second one is 1

Explanation:

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Answer:

Explanation:

Molar mass:

Molar mass of substance is sum of atomic weight of all the atoms of elements present in it.

HCl

Atomic weight of hydrogen = 1.00 amu

Atomic weight of chlorine = 35.45 amu

Atomic weight of HCl =  1.00+35.45 = 36.45 g/mol

K₂SO4:

Atomic weight of potassium = 39.09× 2 = 78.18 amu

Atomic weight of sulfur = 32.07 amu

Atomic weight of oxygen = 15.99×4 = 63.96 amu

Atomic weight of K₂SO4 =  63.96+32.07+ 78.18 = 174.21 g/mol

Ca(OH)₂:

Atomic weight of calcium = 40.08 amu

Atomic weight of oxygen = 15.99 × 2 amu = 31.98 amu

Atomic weight of hydrogen = 1.00 × 2 = 2.00 amu

Atomic weight of Ca(OH)₂ = 74.06 g/mol

NaOH:

Atomic weight of sodium = 22.99 amu

Atomic weight of oxygen = 15.99 amu

Atomic weight of hydrogen = 1.00 amu

Atomic weight of NaOH = 39.98 g/mol

NO₃:

Atomic weight of nitrogen = 14.01 amu

Atomic weight of oxygen = 15.99×3 = 47.97 amu

Atomic weight of NO₃ = 61.98 g/mol

Answer:

The correct answer is A) circulatory

Explanation:

The circulatory system collects metabolic wastes from the blood, which will be eliminated by the kidneys through urine.

The kidneys are responsible for the elimination of waste, acids and excess fluid from the body, maintaining the balance of water, salts and minerals. Blood flows into the kidney through the renal artery.

Answer:

we required 15 ounce tomato sauce for 3 pizza

Explanation:

Given data:

Crust = 4

Cheese = 10 cups

number of ounces of tomato sauce for 3 pizza = ?

Solution:

Recipe and ingredients for one pizza:

1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza

Ingredients required for 3 pizza;

1 × 3 crust + 5 ×3 ounce tomato sauce + 2×3  cups cheese  → 3 pizaa

3 crust + 15 ounce tomato sauce + 6 cups cheese  → 3 pizaa

So we required 15 ounce tomato sauce for 3 pizza.

15 ounce tomato sauce for 3 pizzas.

Given:-

Crust = 4

Cheese = 10 cups

number of ounces of tomato sauce for 3 pizza = ?

1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza

[tex]1 \times 3 crust + 5 \times3 ounce tomato sauce + 2\times3 cups cheese\rightarrow 3 pizaa[/tex]

[tex]3 crust + 15 ounce tomato sauce + 6 cups cheese\rightarrow3 pizaa[/tex]

So we required 15 ounce tomato sauce for 3 pizza.

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Answer: 3.295moles

Explanation:Please see attachment for explanation

Answer:

the wrong option is  The charges on the polar bonds are

arranged so that they are balanced.​

Explanation:

if an electron is more electro negative it has more tendency to pull the valence electron towards itself.

electronegativity is the measure of the tendency of an atom to attract bonding pair of electron towards itself.

electro negativity increases along the group and decreases down the group.

nitrogen is more electronegative than hydrogen so it will tend to attract the bonding pair of electron towards itself.

therefore electrons are not evenly shared between the atoms

Answer:

Electrons are evenly shared among the

atoms.

Explanation:

all the others are obviously wrong

Answer:

104.352°C

Explanation:

Data Given:

Boiling point of water = 100.0°C

Kb (boiling point constant = 0.512°C/m

Concentration of the Mg₃(PO₄)₂ = 8.5 m

Solution:

Formula Used to find out boiling point

               ΔTb = m.Kb . . . . . . (1)

where

               ΔTb = boiling point of solution - boiling point of water

So,

we can write equation 1 as under

               ΔTb = Tb (Solution) -Tb (water)

As we have to find out boiling point so rearrange the above equation

              Tb (Solution)  = m.Kb + Tb (water) . . . . . . . (2)

Put values in Equation 2

            Tb (Solution)  = (8.5 m x 0.512°C/m ) + 100.0°C

            Tb (Solution)  = 4.352 + 100.0°C

            Tb (Solution)  = 104.352°C

so the boiling point of Mg₃(PO₄)₂  8.5 m solution =  104.352°C

Answer: a. 0.05mol/dm3

bi. 0.045mol/dm3

bii. 4.41g/dm3

c. 84.8%

Explanation:Please see attachment for explanation

Answer:

B

Explanation:

I took the test

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wishing you success

Answer: 900.33moles

Explanation:Please see attachment for explanation

Answer:

There are 899.88 moles.

Explanation:

To solve this problem we'll need to use Avogadro's number, which tells us that in one mole of a species, there are 6.023x10²³ atoms (or molecules).

With the above information in mind we can calculate the moles in 5.42x10²⁶ atoms of calcium:

Answer:

A: 2.525 x 10⁻⁴ mol

B: 2.583 x 10⁻⁴ mol

Explanation:

Part A:

Data Given:

Convert Temperature to Kelvin

T = °C + 273

T = 21.3 + 273 = 294.3 K

Convert mL to liter

1000 mL = 1 L

5.1 ml = 5.1/1000 = 0.0051 L

Solution

no. of moles can be calculated by using ideal gas formula

                         PV = nRT

Rearrange the equation for no. of moles

                          n= PV / RT . . . . . . . . . (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm / mol. K

Now put the value in formula (1) to calculate no. of moles of

              n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K

              n = 0.0061 atm.L / 24.162 L.atm.mol⁻¹

              n = 2.525 x 10⁻⁴ mol

no. of moles of gas (H₂O) = 2.525 x 10⁻⁴ mol

_______________

Part B:

Data Given:

Convert Temperature to Kelvin

T = °C + 273

T = 21.3 + 273 = 294.3 K

Convert mL to liter

1000 mL = 1 L

5.2 ml = 5.2/1000 = 0.0052 L

Solution

no. of moles can be calculated by using ideal gas formula

                         PV = nRT

Rearrange the equation for no. of moles

                         n= PV / RT . . . . . . . . . (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm / mol. K

Now put the value in formula (1) to calculate no. of moles of

              n = 1.2 atm x 0.0052 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K

              n = 0.0062 atm.L / 24.162 L.atm.mol⁻¹

              n = 2.583 x 10⁻⁴ mol

no. of moles of gas (H₂) = 2.583 x 10⁻⁴ mol

Answer:

Electrons are always marked negative Hence electronic energy is also always taken as negative. It is because when an electron is at infinite distance from nucleus , there the kinetic energy of that electron can not be calculated. So, it is taken to be zero . ... And thus the energy of electron becomes less negative

Answer:

It corresponds to Charles' Law

Explanation:

Charles's Law corresponds to one of the gas laws, where temperature and volume are related, to constant pressure. That is, according to said equation, the volume of a gas varies directly with the temperature, under conditions of constant pressure.

Second row of periodic table can have maximum of eight electrons which are occupied within s and p block section by occupying 2 and 6 electrons respectively and thus becoming stable thus it doesn't have d block section.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

The elements with the largest atomic radii are located towards the left and bottom of the periodic table (i.e. at the bottom of Group 1). Thus, in theory, the largest atom should be Francium.

it is Francium

Explanation:

Answer:

The correct option is C) Very low

Explanation:

In physics, resistance can be described as the opposition to the flow of current or the flow of electrons. Conductors are known to be materials which can conduct electricity. Hence, conductivity and resistance are opposite to each other. Good conductors will have very little or no resistance and will have enhanced conductivity. On the contrary, insulators are materials which will have more resistance and they cannot conduct electricity as efficiently.

Answer:

low

Explanation:

Nuclear fission

Hope I helped :)

The model illustrates the nuclear process of fission, where a larger nucleus splits into two or more smaller nuclei along with the release of energy.

Nuclear fission is the process illustrated, where a neutron causes a fissile atom like U-235 to split into smaller nuclei, releasing energy and more neutrons. During fission, the nucleus undergoes division, resulting in the production of additional particles and the liberation of energy.

The nuclear process illustrated by the model is nuclear fission. In nuclear fission, a neutron collides with a fissile atom like U-235, creating a heavier unstable isotope, in this case, U-236. This unstable nucleus then undergoes fission, splitting into smaller nuclei and releasing additional neutrons along with a significant amount of energy.

The liquid drop model proposed by Niels Bohr and John Wheeler explains this by comparing the nucleus to a droplet of water. When an external neutron impacts the uranium nucleus, it causes the nucleus to deform and eventually split, similar to a vibrating water droplet eventually breaking apart. The process can be tracked using nuclear symbols, and understanding it is crucial for applications like nuclear reactors where controlled fission is used for electricity generation.

Moreover, the models constructed to describe the nucleus should accurately reflect known nuclear properties and predict new properties that experiments might reveal. These predictions help in understanding nuclear processes such as fission in greater detail.

Final answer:

To find the number of carbon atoms in the empirical formula for C10H22O2, divide each element's subscript by the greatest common divisor, which is 2. The resulting empirical formula is C5H11O, which means there are 5 carbon atoms.

Explanation:

To determine how many carbon atoms are there in the empirical formula corresponding to C10H22O2, you first need to find the simplest whole-number ratio of carbon (C) to hydrogen (H) to oxygen (O) atoms. The molecular formula C10H22O2 shows that the compound has 10 C atoms, 22 H atoms, and 2 O atoms. However, this is not the simplest whole-number ratio. We can divide each of the subscripts by the greatest common divisor, which in this case is 2, to find the empirical formula. So the empirical formula is C5H11O, meaning that the smallest ratio of elements in the compound is 5 carbon atoms to 11 hydrogen atoms to 1 oxygen atom.

Final answer:

The empirical formula for the compound C10H22O2 is achieved by simplifying to the simplest whole-number ratio, resulting in the formula C5H11O, which indicates there are 5 carbon atoms in the empirical formula.

Explanation:

To find out how many carbon atoms there are in the empirical formula for the compound with the molecular formula C10H22O2, we need to simplify the formula by dividing by the greatest common divisor of the subscripts of each element. The goal is to achieve the simplest whole-number ratio of the atoms in the compound.

The numbers of atoms of each element in the molecular formula are in the ratio 10:22:2 for carbon, hydrogen, and oxygen respectively. By simplifying, we find that this ratio can be divided by 2, which gives us 5:11:1. Therefore, the smallest whole-number ratio, which provides us with the empirical formula, is C5H11O. Hence, there are 5 carbon atoms in the empirical formula.

Answer: D is the right option

Explanation: if the speed of the molecules are randomly fast that they are only restricted by the wall of the container, it therefore means that the matter is in gaseous state. If the speed are fast to an extent that they transfer heat to another thereby making them fast to move about, the matter is in liquid state. But when the molecules only vibrate about a fixed point, the matter is in solid state

The correct answer is D. It determines what state the matter is in.

The particular state in which matter is is dependent on the sped of the molecules hat compose matter.

Matter is composed of small particles called molecules. These molecules are in constant motion and bump into each other frequently.

In solids, the molecules that compose matter only vibrate or rotate about a fixed position.

In liquids, the molecules that compose matter can move about at low speed.

Molecules of a gas move at high speed. We can see that the particular state of matter is defined by the speed of the molecules that compose it.

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Answer:

233.856 L

Explanation:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

So first of all you should know the amount of moles that represents 835 g of SO₃. For that, you know that:

So: SO₃= 32 g/mol + 3*16 g/mol= 80 g/mol

Now a rule of three applies as follows: if 80 g of SO₃ are contained in 1 mol, 835 g of the compound, how many moles are there?

[tex]moles=\frac{835 g* 1 mole}{80 g}[/tex]

moles= 10.44

Finally, you apply a new rule of three as follows: if, according to STP, 1 mole occupies a volume of 22.4 L, 10.44 moles, how much volume does it occupy?

volume=[tex]\frac{10.44 moles*22.4 L}{1 mole}[/tex]

volume=233.856 L

The volume of 835 g SO₃ at STP is 233.856 L

To find the volume of 835 g of SO₃ at STP, determine the number of moles and then use the molar volume for gases at STP. The calculation yields approximately 234 liters, the mass, in grams, of a molecule of aspirin (C₉H₈O₄) as 2.99 × 10⁻²² g and   the number of atoms in 5.78 mol NH₄NO₃ as 3.13 × 10²⁵ atoms.

a)The volume, in liters, of 835 g SO₃ at STP can be found by using the molar volume concept. At standard temperature and pressure (STP), one mole of any gas occupies 22.4 liters. Here’s the step-by-step solution:

The molar mass of SO₃ is calculated as follows:

S (Sulfur): 32.07 g/mol

O₃ (Oxygen): 3 × 16.00 g/mol = 48.00 g/mol

Total molar mass of SO₃ = 32.07 + 48.00 = 80.07 g/mol

Number of moles of SO₃ = Mass / Molar mass = 835 g / 80.07 g/mol ≈ 10.43 mol

Molar volume at STP = 22.4 L/mol

Volume of SO₃ = Number of moles × Molar volume = 10.43 mol × 22.4 L/mol ≈ 233.63 L

b. Mass of a molecule of aspirin (C₉H₈O₄):

First, find the molar mass of aspirin:

Molar mass of C₉H₈O₄ = 9 × 12.01 (C) + 8 × 1.01 (H) + 4 × 16.00 (O)

Molar mass ≈ 180.17 g/mol

Next, use Avogadro's number (6.022 × 10²³ molecules/mol) to find the mass of one molecule:

Mass of one molecule = molar mass / Avogadro's number

                = 180.17 g/mol / (6.022 × 10²³ molecules/mol)

                 ≈ 2.99 × 10⁻²² g

c. Number of atoms in 5.78 mol NH₄NO₃

First, determine the number of molecules in 5.78 mol:

Number of molecules = 5.78 mol × 6.022 × 10²³ molecules/mol

                                  ≈ 3.48 × 10²⁴ molecules

Next, determine the total number of atoms in one molecule of

NH₄NO₃: 1 N + 4 H + 1 N + 3 O = 9 atoms

So, the total number of atoms is:

Total atoms = 3.48 × 10²⁴ molecules × 9 atoms/molecule

                   ≈ 3.13 × 10²⁵ atoms

Therefore, the volume of 835 g SO₃ at STP is approximately 234 liters, the mass, in grams, of a molecule of aspirin (C₉H₈O₄) is 2.99 × 10⁻²² g and   the number of atoms in 5.78 mol NH₄NO₃ is 3.13 × 10²⁵ atoms.

Complete question.

Find each of the following quantities:

a. the volume, in liters, of 835 g SO₃ at STP

b. the mass, in grams, of a molecule of aspirin (C₉H₈O₄)

c. the number of atoms in 5.78 mol NH₄NO₃

Answer:

The correctly matched pair is :

[tex]NH_{3}[/tex] is Polar

Explanation:

Polarity is decided by net dipole moment . If a molecule has 0 dipole moment then it is non-polar .

If a molecule has some value of dipole moment then it is polar.Unit of dipole moment is Debye(D)

[tex]{dipole moment = charge \times distance}[/tex]

In chemical value of dipole is based on two factors :

1. There should be heteroatomic bond in a given compound..e.g H-Cl , C-N

(not C-C, N-N)

2. The molecule should be unsymmetrical in shape.

note : even if all bonds are heteroatomic but shape is symmetrical , then also dipole moment can be zero

CORRECT MATCHES

[tex]H_{2}O[/tex] : Polar

It has net dipole moment of 1.85 D because its shape is bent (unsymmetrical) and all bonds are heteroatomic.

[tex]CH_{4}[/tex] :Non-Polar

All bonds are heteroatomic(C-H) but shape is symmetrical(tetrahedral), so net dipole is zero

[tex]CO_{2}[/tex] : Non -Polar

All bonds are heteroatomic(C=O) but shape is symmetrical(linear), so net dipole is zero

NH3 is correctly identified as polar due to its trigonal pyramidal shape causing an unequal electron distribution. In contrast, H2O is polar (not non-polar), CH4 is non-polar (not polar), and CO2 is non-polar (not polar), illustrating the importance of geometric arrangement in determining molecular polarity.

The question involves understanding molecular polarity, a fundamental concept in chemistry. The correct pairing from the options provided is NH3: polar. Let's delve into the rationale behind this answer and correct the misconceptions concerning the other molecules listed.

To summarize, molecular polarity is determined not only by the presence of polar bonds but also by the molecule's geometry. In this context, NH3 is the correct answer since it is polar due to its geometry leading to an unequal distribution of electron density.

Answer:

7.71 atm

Explanation:

Given the following data:

[tex]V = 5 L[/tex]

[tex]n_{He} = 3 mol[/tex]

[tex]n_{H_2} = 4 mol[/tex]

[tex]p_1 = 9 atm[/tex]

[tex]T = const[/tex]

According to the ideal gas law, we know that the product between pressure and volume of a gas is equal to the product between moles, the ideal gas law constant and the absolute temperature:

[tex]pV = nRT[/tex]

Since the temperature and the ideal gas constant are constants, as well as the fixed container volume of 5 L, we may rearrange the equation as:

[tex]\frac{p}{n}=\frac{RT}{V}=const[/tex]

This means for two conditions, we'd obtain:

[tex]\frac{p_1}{n_1}=\frac{p_2}{n_2}[/tex]

Given:

[tex]p_1 = 9 atm[/tex]

[tex]n_1 = n_{initial total} = n_{He} + n_{H_2} = 3 mol + 4 mol = 7 mol[/tex]

[tex]n_2 = n_{final total} = n_{He} + n_{H_2} = 3 mol + 4 mol + 2 mol = 9 mol[/tex]

Solve for the final pressure:

[tex]p_2 = p_1\cdot \frac{n_2}{n_1}[/tex]

Now, according to the Dalton's law of partial pressures, the partial pressure is equal to the total pressure multiplied by the mole fraction of a component:

[tex]p_{H_2}=\chi_{H_2}p_2[/tex]

Knowing that:

[tex]p_2 = p_1\cdot \frac{n_2}{n_1}[/tex]

And:

[tex]\chi_{H_2}=\frac{n_H_2}{n_2}[/tex]

The equation becomes:

[tex]p_{H_2}=\chi_{H_2}p_2=p_1\cdot \frac{n_2}{n_1}\cdot \frac{n_H_2}{n_2}=p_1\cdot \frac{n_H_2}{n_1}[/tex]

Substituting the variables:

[tex]p_{H_2}=9 atm\cdot \frac{4 mol + 2 mol}{7 mol}=7.71 atm[/tex]

Answer:

1.024 x 10⁻²²g

Explanation:

Data Given:

mass of copper = 63.5 g

no. of atoms of copper = 6.02 x10²³ atoms

mass of of an average copper = ?

Solution:

As 6.02 x10²³ atoms have 63.5 g of mass then what will be the mass of atom.

Apply unity formula

                     63.5 g of copper ≅ 6.02 x10²³ atoms of copper

                     mass of copper atom ≅ 1 atom of copper

Do cross multiplication

                     mass of copper atom = 1 atom x 63.5 g / 6.02 x10²³ atoms

                     mass of copper atom = 1.024 x 10⁻²² g

mass of an average copper atom = 1.024 x 10⁻²² g

Answer:

Hellium

Explanation:

Data Given:

Krypton

Helium

Xenon

Neon

doesn't have true Octet =?

Solution:

Octet Rule:

The atoms have 8 electrons in their valence shell and have stable electronic configuration.

Now we will look for the electronic configuration of each given noble gas to look for octet rule

1. Krypton (Kr)

Atomic No. 36

Electrons per shell: 2, 8, 18, 8

Electronic configuration: [Ar] 3d¹⁰, 4s², 4p⁶

So

it have 8 electrons in its outer (valance) shell and obey octet rule

___________________

2. Hellium (He)

Atomic No. 2

Electrons per shell: 2

Electronic configuration: 1s²

So

It have 2 electrons in its outer (valance) shell and do not obey octet rule. although it is stable and obey duplet rule but not have true octet.

_____________________

3. Xenon (Xe)

Atomic No. 54

Electrons per shell: 2, 8, 18, 18, 8

Electronic configuration: [Kr] 4d¹⁰, 5s², 5p⁶

So

it have 8 electrons in its outer (valance) shell and obey octet rule

___________________

4. Neon (Ne)

Atomic No. 10

Electrons per shell: 2, 8

Electronic configuration: 1s², 2s², 2p⁶

So

it have 8 electrons in its outer (valance) shell and obey octet rule

___________________

So its only the hellium that do not have octet.