Chapter 3: Q19DQ (page 83)
Question:Chlorine exists mainly as two isotopes, 37Cl and 35Cl. Which is more abundant? How do youknow?
Answer
The more abundant one is 35Cl.
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A 2.077-g sample of an element, which has an atomic mass between 40 and 55, reacts with oxygen to form 3.708 g of an oxide. Determine the formula of the oxide and identify the element.
The mass spectrum of bromine consists of three peaks with the following relative sizes:
Mass(u) | Relative size |
157.84 | 0.2534 |
159.84 | 0.5000 |
161.84 | 0.2466 |
How do you interpret these data, and what is the relative abundance of the bromine isotopes?
Question:Consider the equation You react 4 moles of A with 2 moles of B. Which of thefollowing is true?
a. The limiting reactant is the one with the higher molar mass.
b. A is the limiting reactant because you need 6 moles of A and have 4 moles.
C. B is the limiting reactant because you have fewer moles of B than A.
d. B is the limiting reactant because three A molecules react with each B molecule.
e. Neither reactant is limiting.
Justify your choice. For those you did not choose, explain why they are incorrect.
Consider the following unbalanced reaction:
How many grams of are needed to produce 120.g of if the reaction has a 78.1% yield?
Question:Which (if any) of the following is true regarding the limiting reactant in a chemical reaction?
a. The limiting reactant has the lowest coefficient in a balanced equation.
b. The limiting reactant is the reactant for which you have the fewest number of moles.
c. The limiting reactant has the lowest ratio of moles available/coefficient in the balancedequation.
d. The limiting reactant has the lowest ratio of coefficient in the balanced equation/molesavailable.
Justify your choice. For those you did not choose, explain why they are incorrect.
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