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Chemistry
Please determine whether the following statements about stoichiometry and chemical reactions are true or false.
(a) Stoichiometry is the study of mass relationships in chemical reactions.
(b) To determine mass relationships in a chemical reaction, you first need to know the balanced chemical equation for the reaction.
© To convert from grams to moles and vice versa, use Avogadro’s number as a conversion factor.
(d) To convert from grams to moles and vice versa, use molar mass as a conversion factor.
(e) A limiting reagent is the reagent that is used up first.
(f) Suppose a chemical reaction between A and B requires 1 mol of $A$A and 2 mol of $B$B. If 1 mol of each is present, then $\mathrm{B}$B is the limiting reagent.
(g) Theoretical yield is the yield of product that should be obtained according to the balanced chemical equation.
(h) Theoretical yield is the yield of product that should be obtained if all limiting reagent is converted to product.
(i) Percent yield is the number of grams of product divided by the number of grams of the limiting reagent times 100.
(j) To calculate percent yield, divide the mass of product formed by the theoretical yield and multiply by 100.
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(a) True. Stoichiometry involves studying the mass relationships in chemical reactions.
(b) True. The balanced chemical equation is necessary to determine the mass relationships in a chemical reaction.
© False. Molar mass, not Avogadro’s number, should be used to convert between grams and moles.
(d) True. Molar mass is used to convert between grams and moles.
(e) True. The limiting reagent is the one that gets used up first in a chemical reaction.
(f) False. In this case, A is the limiting reagent because the reaction requires 1 mol of A and 2 mol of B, but only 1 mol of each is present.
(g) True. Theoretical yield refers to the amount of product that should be obtained based on the balanced chemical equation.
(h) True. Theoretical yield is the maximum amount of product that can be obtained if all of the limiting reagent is converted to product.
(i) False. Percent yield is calculated by dividing the actual yield (in grams) by the theoretical yield and multiplying by 100.
(j) True. To calculate percent yield, divide the mass of the actual product obtained by the theoretical yield and multiply by 100.
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