The element initially has an atomic number of 88 and it decays to an atomic number of 82. This is achieved by the emission of three alpha particles in a process known as radioactive decay. No beta particles are emitted in this case.
Explanation:In your question, an element of atomic number 88 decays to an element of atomic number 82. This radioactive decay is a form of alpha decay. In alpha decay, the atomic number decreases by two and the mass number decreases by four, as one alpha particle (consisting of two neutrons and two protons) is emitted from the nucleus.
Therefore, in order to move from an atomic number of 88 to 82, three alpha particles must be emitted. The emission of any beta particles (which transform a neutron into a proton) would have the effect of increasing the atomic number, which is not what happens in this case.
Hence, the correct answer is three alpha particles.
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What is the total number of moles of hydrogen gas contained in 9.03 × 1023 molecules?
Answer:
1.5 mol.
Explanation:
It is known that every 1.0 mole of compound or element contains Avogadro's number (6.022 x 10²³) of molecules or atoms.Using cross multiplication:
1.0 mole of H₂ contains → 6.022 x 10²³ molecules.
??? mole of H₂ contains → 9.03 x 10²³ molecules.
∴ The no. of moles of H₂ contains (9.03 x 10²³ molecules) = (1.0 mol)(9.03 x 10²³ atoms)/(6.022 x 10²³ atoms) = 1.5 mol.
To find the total number of moles of hydrogen gas in 9.03 × 10²³ molecules, you divide the number of molecules by Avogadro's number (6.022 × 10²³ molecules/mole), resulting in approximately 1.5 moles of hydrogen gas.
To calculate the total number of moles of hydrogen gas (H₂) from the given number of molecules, we use Avogadro's number, which is 6.022 × 10²³ molecules per mole. The number of moles (n) is given by the formula:
n = {Number of molecules} ÷ {Avogadro's number}
Substituting our values, we get:
n = (9.03× 10²³ molecules ÷ 6.022 × 10²³ molecules/mole) ≈ 1.5 moles
Therefore, there are approximately 1.5 moles of hydrogen gas contained in 9.03 × 10²³ molecules of hydrogen gas.
Question 1(Multiple Choice Worth 4 points)
(08.02 HC)
How many liters of 4.0 M NaOH solution will react with 0.30 liters 4.0 M H2SO4?
H2SO4 + NaOH → Na2SO4 + H2O
1.6 L
1.2 L
0.90 L
0.60 L
Answer:
0.60 L.
Explanation:
How many moles of [tex]\rm H_2SO_4[/tex]?
[tex]n(\mathrm{H_2SO_4}) = c\cdot V = 4.0\times 0.30 = \rm 1.2\; mol[/tex].
How many moles of [tex]\rm NaOH[/tex] will react with all that 1.2 moles of [tex]\rm H_2SO_4[/tex]?
Balance the equation:
[tex]\rm H_2SO_4 + 2\; NaOH \to Na_2SO_4 + 2\;H_2O[/tex].
The coefficient in front of [tex]\rm H_2SO_4[/tex] is 1. The coefficient in front of [tex]\rm NaOH[/tex] is 2. Hence the ratio:
[tex]\displaystyle \frac{n(\mathrm{NaOH})}{n(\mathrm{H_2SO_4})} = \frac{2}{1} = 2[/tex].
Therefore
[tex]\displaystyle n(\mathrm{NaOH}) = \frac{n(\mathrm{NaOH})}{n(\mathrm{H_2SO_4})} \cdot n(\mathrm{H_2SO_4}) = 2\times 1.2 = \rm 2.4\;mol[/tex].
What will be the volume of the [tex]\rm NaOH[/tex] solution?
[tex]\displaystyle V(\mathrm{NaOH}) = \frac{n}{c} = \frac{2.4}{4.0} = \rm 0.60\;L[/tex].
Cholesterol is an example of a(n) _____.
monosaccharide polysaccharide
lipid
enzyme
Cholesterol is an example of a lipid.
Cholesterol is an example of a(n) lipid. Hence, option C is correct.
What is a lipid?A lipid is any of various organic compounds that are insoluble in water.
Cholesterol is one of several types of fats (lipids) that play an important role in your body.
Cholesterol is a waxy substance found in all cells of the body.
The body needs it to make hormones, Vitamin D, and substances that aid in digestion.
The liver makes all the cholesterol needed for these functions.
Hence, option C is correct.
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How many moles of aluminum are needed to react completely with 1.2 mol of feo
Answer:
0.80 mol AlExplanation:
1) Word reaction:
Aluminum + ferrous oxide → aluminum oxide + ironThis is a single replacement reaction, in which aluminum, a more acitve metal than iron, replaces the iron in the ferrous oxide to form aluminum oxide and iron.
2) Skeleton chemical equation:
Al + FeO → Al₂O₃ + Fe3) Balanced chemical equation:
Add the coeffcients to comply with the law of conservation of mass:
2Al + 3FeO → Al₂O₃ + 3Fe4) Mole ratio of Al and FeO:
2 mol Al : 3 mol FeO5) Set a proportion with the unkown and solve:
x / 1.2 mol FeO = 2 mol Al / 3 mol FeOx = 1.2 mol FeO × 2 mol Al / 3 mol FeO = 0.80 mol Al ← answerwhat is the volume of 2.00 moles of ideal gas at 25'c and 121.59 kpa of pressure
Answer:
40.73 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 121.59 kPa/101.325 = 1.2 atm).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = 2.0 mol).
R is the general gas constant (R = 0.082 L.atm/mol.K),
T is the temperature of the gas in K (T = 25°C + 273 = 298 K).
∴ V = nRT/P = (2.0 mol)(0.082 L.atm/mol.K)(298 K)/(1.2 atm) = 40.73 L.
The decomposition of N2O5 can be described by the equation.2N2O5 (soln) ---> 4NO2 (soln) + 2 (g)Given this data for the reaction at 45 degrees C in carbon tetrachloride solution, calculate the average rate for each successive time interval.t(s) [N2O5] (M)0 2.10195 1.86556 1.48825 1.25Interval: 0 s to 195 sReaction rate= _____M/s195 s to 556 sReaction rate= _____M/s556 s to 825 sReaction rate= _____M/s
Answer:
Rate 1 => 1.2E-3 M/s, Rate 2 => 1.05E-3 M/s, Rate 3 => 8.9E-4 M/s
Explanation:
Rate = Δ[N₂O₅]/Δtime
Rate 1 = (1.86556 - 2310195)M/(195 - 0)s = -1.2 x 10⁻³ M/s
Same for Rates 2 & 3.
The rate of reaction can be calculated in terms of the consumption of the reactants in the reaction.
In the given equation [tex]\rm N_2O_5[/tex] has been the reactant that has been used 2 moles.
The rate of the reaction has been = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{dN_2O_5}{dt}[/tex]
The reaction rate for time interval 0s - 195 sec, can be given by:Reaction rate = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.86556\;-\;2.10195}{195\;s\;-\;0\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.23639}{195\;s}[/tex]
= 0.0006 M/s.
The rate of reaction for time interval 195s - 556s, can be given by:Reaction rate = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.48825\;-\;1.86556}{556\;s\;-\;195\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.416735}{361\;s}[/tex]
= 0.0005 M/s
The rate of reaction for time interval 556s - 825s, can be given by:= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.25\;-\;1.48825}{825\;s\;-\;556\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.23825}{269\;s}[/tex]
= 0.0004 M/s.
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The rate of a standard reaction is 0.01840 M/s at 25 oC. It is determined that this is too fast, and that the rate should be reduced to 0.0046 M/s. What temperature should the reaction be run at to achieve this? A. 45 oC B. 20 oC C. 15 oC D. 5 oC E. 0 oC
Hi there,
Your answer is given in the image attached above
Answer:
Option B. 20 oC
Explanation:
Thinking process:
The initial reaction takes place at: 0.01840 M/s at 25 oC.
However, the rate must be reduced to 0.0046 M/s.
It is most likely that a temperature of 20 °C is used her. This is because it offers sufficient kinetic energy to effect the reaction rate of the reaction substances.
The electron configuration for phosphorous is 1s22s22p63s23p3. What is the lewis electron dot diagram for phosphorous?
Answer:
See the picture attached for the Lewis electron dot diagram for phosphorus.Explanation:
The Lewis electron diagram is a representation of the atoms that shows the the valence electrons present in the atom.
The Lewis electron diagram uses the chemical symbol of the element and adds one dot for every valence electron. The dots (valence electrons) are placed around the chemical symbol.
So, for phosphorues:
Chemical symbol: PNumber of valence electrons: 5 (theses are the five electrons in the outermost shell, two in 3s² plus three in 3p³).So you get the picture attached, with the chemical symbol P at the center, surroundeb by 5 dots: two dots above, one dot to the left, one dot to the right, and one dot below the chemical symbol.
Please, click on the image if you want to see it separately
The Lewis electron dot diagram for phosphorus shows five dots arranged around the elemental symbol 'P', indicating the five valence electrons.
Explanation:The student has asked for the Lewis electron dot diagram for phosphorus based on its electron configuration, which is 1s²2s²2p⁶3s²3p³. Phosphorus has a total of 15 electrons with the valence electrons being the most important for the Lewis structure. Considering the electron configuration, phosphorus has 5 valence electrons (in the 3s and 3p subshells). The Lewis dot diagram represents these 5 valence electrons as dots surrounding the symbol for phosphorus (P):
P : . .
.
.
Why are chemists great for solving problems?
Because only those with logic (problem solving capabilities) go to chemistry.
Chemists are great for solving problems due to their analytical skills and systematic approach to research.
They have a deep understanding of chemical properties and reactions, which allows them to develop solutions to complex issues. Their training in laboratory techniques equips them to design and conduct experiments effectively.
Chemists can identify and isolate variables, making it easier to pinpoint the root cause of a problem. They also excel in data analysis, interpreting results to draw meaningful conclusions.
Their ability to think critically and creatively helps them devise innovative solutions. Furthermore, chemists are skilled in collaborating with other scientists and professionals, bringing a multidisciplinary approach to problem-solving.
This combination of skills and knowledge makes chemists highly effective in addressing and resolving a wide range of challenges.
Which of the following could cause a gaseous substance to liquify?
F, An increase in pressure
G, An increase in volume
H, An increase in temperature
J, A decrease in number of moles
Answer:
f
Explanation:
pressure
How has the work of chemists affected the environment?
A. A single chemical can sometimes both hurt and help the
environment.
B. The chemicals that chemists use can all be helpful to the
environment.
C. The work of some chemists causes environmental problems,
while the work of others tries to fix problems.
D. All chemists use chemicals that are bad for the environment.
The work performed by the chemists can be considered as the useful effect to fix a problem, while some work found to harm the environment. Thus, option C is correct.
Who are Chemists?Chemists are the group of individuals that deal with the drugs and the medicines. The research made the development of the new drugs and the compounds that are used by the population to treat several diseases.
The chemicals dealt by chemist are formed to be sensitive, and can be used to fix the problems, while sometimes the effect creates the compound that harm the environment.
Thus, option C is correct.
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Question 9(Multiple Choice Worth 4 points)
(08.01 LC)
What happens to water when it warms above 4 °C?
It contracts.
It forms ice.
Its density decreases.
Its composition changes.
Answer: It contracts and its density decreases, I believe.
Explanation:
Answer:
its density decreases
Explanation:
Which location represents the enthalpy of reaction?
Answer:
Kindly find the attached image.
Explanation:
All the data related to the potential energy diagram is shown in the attached image.Reactants, intermediate, products, activation energy (Ea), and enthalpy change (ΔH).
Enthalpy change (ΔH) is the difference in energy between reactants and products.
ΔH = E of products - E of reactants.
Answer: Arrow E represents the enthalpy of the reaction.
Explanation:
Enthalpy of the reaction is defined as the difference in the potential energy of the products and the reactants. It is represented as [tex]\Delta H_{rxn}[/tex]
[tex]\Delta H_{rxn}=H_{products}-H_{reactants}[/tex]
From the image, the points marked represents:
Point A represents the potential energy of the reactants.
Point B represents the intermediate state or transition state in a reaction.
Point C represents the potential energy of the products.
Arrow D represents the activation energy of the reaction.
Arrow E represents the enthalpy of the reaction.
Hence, arrow E represents the enthalpy of the reaction.
Only element in the halide family that is a liquid. What is this element
Answer:
Bromine.
Explanation:
That is bromine which is a dark red vaporous liquid with a bad smell. There are only 2 elements which are liquid at room temperature, bromine and mercury.
"Do you own a dog?" might be an example of which concept?
Pneumograph
Detection cue
Control question
Baseline answer
The concept illustrated in the question, "Do you own a dog?", is a control question. A control question is used to establish a baseline response for comparison.
Explanation:The concept illustrated in the question, "Do you own a dog?", is a control question.
A control question is a type of question used to establish a baseline response for comparison. It is typically unrelated to the topic being discussed and is used to ensure the accuracy and reliability of the answers given.
In this example, asking someone if they own a dog would serve as a control question if the actual topic of conversation is something unrelated to dogs or pets.
One gram of salt in 100 liters of water could be considered a _______________________ solution. A) concentrated B) dilute C) saturated D) supersaturated
Answer:I believe your answer would be option B) dilute. Hope this helps.
Explanation:
The correct answer is B) Dilute
Explanation:
In a solution, the proportions of the solute vs the solvent determine the type of solution that includes dilute/concentrated or unsaturated, saturated and supersaturated. In the case of a dilute solution, this occurs if there is a small amount of the solute in comparison to the amount of solvent, which makes it possible to add more solute as this can be dissolved. This type of solution applies to the case presented because one gram of salt (solute or substance dissolved) is a small quantity of solute in comparison to the amount of solvent (the substance that dissolves) that in this case is 100 liters of water. Thus, in this case, there is a dilute solution.
Select the true statement. ANSWER Unselected Anions are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. Unselected Anions are smaller than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus. Unselected Cations are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. Unselected Cations are smaller than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus. Unselected
Cations, or positive ions, are smaller than their parent atoms because they have fewer electrons resulting in less electron-electron repulsion. Anions, or negative ions, are larger than their parent atoms because additional electrons increase electron-electron repulsion.
Explanation:The true statement in the choices given is: 'Cations are smaller than their neutral parent atoms because there are fewer electrons "competing" for the attractive force of the protons in the nucleus'.
When an atom forms a cation, or a positive ion, it loses one or more electrons from its valence shell. This reduction in the number of electrons minimizes the electron-electron repulsion and allows the protons in the nucleus to pull the remaining electrons closer, making the radius of the cation smaller than the parent atom. For example, an aluminium atom has a larger radius than an aluminium cation because the cation has fewer electrons, hence the remaining electrons are pulled closer to the nucleus.
On the other hand, anions form when a neutral atom gains one or more electrons in its valence shell. The added electrons increase repulsion among the electrons, causing the radius of an anion to be larger than that of its parent atom. For example, a sulfur atom has a smaller radius than a sulfide anion because the anion has more electrons, thus they spread out more due to increased electron-electron repulsion.
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The correct statement is that cations are smaller than their neutral parent atoms because there are less electrons competing for the attractive force of the protons in the nucleus. Conversely, anions are larger than their neutral parent atoms due to more electrons competing for the attractive force of the protons.
Explanation:The correct statement is: Cations are smaller than their neutral parent atoms because there are fewer electrons “competing” for the attractive force of the protons in the nucleus. A cation is a positively charged ion that is formed when a neutral atom loses one or more electrons from its valence shell. This loss of electrons results in a smaller atomic radius because there are fewer electrons 'competing' for the attractive force of the protons, allowing the atom to pull the remaining electrons closer to the nucleus.
Conversely, an anion is a negative ion that is formed when a neutral atom gains one or more electrons. This results in a greater repulsion among the electrons, which results in an increase in atomic radius. Hence, anions are larger than their neutral parent atoms because there are more electrons “competing” for the attractive force of the protons in the nucleus.
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A balanced chemical equation used to prepare ammonium carbonate, (nh4)2co3 , is: 2 n h 3 ( g ) + c o 2 ( g ) + h 2 o ( l ) ⟶ ( n h 4 ) 2 c o 3 which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?
Final answer:
The greatest amount of ammonium carbonate is produced when reactants NH3, CO2, and H2O are used in the mole ratio of 2:1:1, ensuring an excess of water.
Explanation:
To determine the reactant quantities that would result in the greatest amount of ammonium carbonate being formed, we must look at the stoichiometry of the balanced chemical equation provided:
2NH3(g) + CO2(g) + H2O(l) → (NH4)2CO3
According to this equation, therefore, the greatest amount of ammonium carbonate will be produced when reactants are supplied in the mole ratio of 2:1:1 for NH3:CO2:H2O, respectively. Choosing reactant quantities that provide ammonia and carbon dioxide in at least this ratio, while ensuring an excess of water, would maximize production of ammonium carbonate.
if 5 gases in a cylinder each have a partial pressure of 2.50 atm ,what is the total pressure exerted by the gases?
Answer:
12.5 atm.
Explanation:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas:Ptotal = P1 + P2 + … + Pn.
∴ Ptotal = P of gas 1 + P of gas 2 + P of gas 3 + P of gas 4 + P of gas 5.
∴ Ptotal = 5(2.5 atm) = 12.5 atm.
The unique characteristic of the amino acid cysteine is _____.
Answer: since it has a very reactive sulfhydryl group at its side chain. This puts cysteine in special position that cannot be replaced or substituted by any other amino acid. Because disulfide bridges formed by cysteine residues are permanent component of protein primary structure.
Explanation:
NaOH + HCl → NaCl + H2O
An instructor is planning to demonstrate this reaction to a class as an example of a neutralization reaction. She does a test run, using NaOH pellets and 1.0 M HCl. The reaction mixture spatters. She concludes that this is unsafe; the reaction rate is too fast. How can she slow it down?
A)
heat the HCl
B)
use 0.2 M HCl
C)
add a catalyst
D)
grind the NaOH pellets to a powder
The correct answer is B).
Answer:
B) use 0.2 M HCl
Explanation:
Lowering the concentration of a reactant will slow down the rate of reaction. If she would use 0.2 M HCl, the reaction rate will be slower than with 1.0 M HCl. The other choices would increase the rate of reaction, making it even more dangerous.
Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. To solve this problem, research has been conducted on alternative energy sources. One alternative energy source is nuclear energy. Although nuclear energy is a good solution to this problem, there are concerns.
All BUT ONE of these describe a concern about nuclear energy.
A) presence of radioactive waste
B) little if any carbon emissions released into the air
C) contamination risk when transporting radioactive materials
D) thermal pollution from water released into nearby environment
The answer is D
Hope this helped
Answer:
If you only want to look at concerns then B would be the correct answer because that is a positive when using nuclear energy
Explanation:
Question 8(Multiple Choice Worth 4 points)
(08.05 LC)
Which statement is true for a solution when its concentration of hydronium ions increases?
It becomes less acidic.
Its pH value increases.
Its pH value decreases.
It becomes more alkaline.
The true statement for a solution when its concentration of hydronium ions increases then pH decreases.
What is pH?pH of any solution is used to define the acidity, basicity or neutrality of the solution.
pH ranges from 0 to 6.9 shows acidity.pH 0 shows the neutrality.pH ranges from 7.1 to 14 shows basicity.pH will be calculated as:
pH = -log[H⁺]
From the equation it is clear that concentration of hydronium ion increases, pH value decreases and acidity increases.
Hence, pH value decreases as hydronium ion increases.
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Which of these is the scientific name for the organism? Question 1 options: puma concolor
panther
puma
mountain lion
Answer:
All of the above
Explanation:
Panthers, pumas, and mountain lions are all the same animal. Just different names. So, all of these would be correct.
Any organism or particle that can cause an infectious disease is called a
bacteriavirusviroidpathogen
Answer:
PATHOGEN.
Explanation:
In biology, pathogen refers to any organism or particle that is capable of causing infectious diseases. Thus, all the microbes that cause diseases such as bacteria, virus, fungi, viroid, etc are collectively known as pathogen. The entrance of pathogen into the human body usually stimulate the immune system. The immune system functions by recognizing pathogens and by capturing and destroying them.
PLEASE HELP IM TAKING MY CHEMISTRY FINALS RIGHT NOW
** GIVING 15 POINTS PLUS BRAINLIEST **
During a synthesis reaction, 2.4 grams of magnesium reacted with 8.0 grams of oxygen. What is the maximum amount of magnesium oxide that can be produced during the reaction?
Mg + O2 → MgO
A. 2.1 grams
B. 2.8 grams
C. 3.6 grams
D. 3.9 grams
Answer:
its d 3.9 not c
Explanation:
To find the maximum amount of magnesium oxide produced during the reaction, we need to determine the limiting reactant and calculate the moles of magnesium oxide produced. Using the mole ratio and converting grams to moles, we find that the maximum amount is 3.99 grams.
Explanation:To determine the maximum amount of magnesium oxide that can be produced during the reaction, we need to find the limiting reactant. First, we convert the given masses of magnesium and oxygen to moles using their respective molar masses. The balanced chemical equation tells us that the mole ratio of magnesium to magnesium oxide is 1:1, so the number of moles of magnesium is equal to the number of moles of magnesium oxide. Lastly, we convert the moles of magnesium oxide to grams using its molar mass to find the maximum amount of magnesium oxide that can be produced.
2.4 g Mg x (1 mol Mg / 24.31 g Mg) = 0.099 mol Mg8.0 g O2 x (1 mol O2 / 32.00 g O2) = 0.250 mol O2The mole ratio of Mg to MgO is 1:1, so we have 0.099 mol MgO0.099 mol MgO x (40.31 g MgO / 1 mol MgO) = 3.99 g MgOTherefore, the maximum amount of magnesium oxide that can be produced during the reaction is 3.99 grams.
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The unique characteristic of the amino acid cysteine is _____.
a high level of acidity
its ability to form hydrogen bonds
its ability to form disulfide bridges a second amino group
Answer:
C. the last one
Explanation:
Cysteine's unique characteristic is its ability to form disulfide bridges, covalent bonds that provide structural stability to proteins. The formation of these bridges is a unique property of cysteine among the amino acids, even though it, like others, can form hydrogen bonds.
Explanation:The unique characteristic of the amino acid cysteine is its ability to form disulfide bridges. These bridges are covalent bonds that provide structural stability to proteins. While cysteine is capable of forming hydrogen bonds like other amino acids, its special characteristic is indeed the formation of these disulfide bridges. Two cysteine residues can come together to form a disulfide bridge, helping to stabilize the three-dimensional structure of the protein. It is notable that hydrogen bonds are weak interactions that occur broadly between many different molecules, but the covalent bonding of disulfide bridges is a unique property of cysteine within the amino acid series.
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One mole of which of these compounds contains two moles of hydrogen atoms?
NaOH
H2S
NH3
CH4
Answer:
One mole of H₂S contains 2 atoms of hydrogen
Explanation:
In one mole of NaOH : 1 atom of Na and 1 atom of O and 1 atom of H
one mole of H₂S : 2 atoms of H and 1 atom of S
one mole of NH₃ : 1 atom of N and 3 atoms of H
One mole of CH₄ : 1 atom of C and 4 atoms of H
The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay was found to be 269 disintegrations per minute. calculate the half-life, in days, for the decay of this sample.
Answer:
[tex]\boxed{\text{1.81 da}}[/tex]
Explanation:
1. Calculate the decay constant
The integrated rate law for radioactive decay is 1
[tex]\ln\dfrac{A_{0}}{A_{t}} = kt[/tex]
where
A₀ and A_t are the counts at t = 0 and t
k is the radioactive decay constant
[tex]\ln \dfrac{846}{269} = k \times 3.00\\\\\ln3.145 = 3.00k\\1.146 = 3.00k\\\\k =\dfrac{1.146}{3}\\\\k = \text{0.382 /da}\\[/tex]
2. Calculate the half-life
[tex]t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{0.382} = \text{1.81 da}[/tex]
The half-life for decay is [tex]\boxed{\textbf{1.81 da}}[/tex].
How many grams are in 1.946 moles of nacl
Answer:
113.8g
Explanation:
Statement of problem: mass of 1.946mole of NaCl
Given parameters:
Number of moles of NaCl = 1.946mole
Unknown: mass of NaCl
Solution
To find the mass of NaCl, we apply the concept of moles which expresses the relationship between number of moles and mass according to the equation below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
To find the molar mass of NaCl:
the atomic mass of Na = 23g
atomic mass of Cl = 35.5g
Molar mass of NaCl = (23 + 35.5) = 58.5gmol⁻¹
Mass of NaCl = Number of moles x molar mass of NaCl
Mass of NaCl = 1.946 x 58.5 = 113.8g
There would be approximately 113.72 grams in 1.946 moles of NaCl. This is calculated by using the molar mass of NaCl (58.44 g/mol) and multiplying it by the number of moles given.
Explanation:To find out how many grams are in 1.946 moles of NaCl, you need to use the molar mass of NaCl. The molar mass is the mass of one mole of a substance and for NaCl, it is calculated by adding the atomic masses of Sodium (Na) and Chlorine (Cl), which is approximately 58.44 grams per mole. Therefore, to find out the mass in grams of 1.946 moles of NaCl, you multiply 1.946 moles by the molar mass of NaCl, 58.44 g/mol.
1.946 moles NaCl * 58.44 g/mol NaCl = 113.72 grams NaCl
So, 1.946 moles of NaCl is approximately equal to 113.72 grams.
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