Chemistry Stoichiometry. 45 points. Do not turn page until told to do so.

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1 Chemistry 2010 Stoichiometry 45 points Do not turn page until told to do so.

2

3 Stoichiometry Multiple Choice (Each worth 2 points) Identify the letter of the choice that best completes the statement or answers the question. 1. To determine the limiting reactant in a chemical reaction, one must know the a. speed of the reaction. b. amount of product formed. c. available amount of one of the reactants. d. available amount of each reactant. 2. In the reaction 2Al 2 O 3 4Al + 3O 2, what is the mole ratio of aluminum to oxygen? a. 4:3 c. 10:6 b. 2:3 d. 3:4 3. For the balanced reaction Mg + 2HCl H 2 + MgCl 2, calculate the percentage yield of magnesium chloride if 100. g of magnesium react with excess hydrochloric acid to yield 330. g of magnesium chloride. a. 81.6% c. 84.2% b. 71.8% d. 74.3% 4. A balanced chemical equation allows one to determine the a. mechanism involved in the reaction. b. energy released in the reaction. c. electron configuration of all elements in the reaction. d. mole ratio of any two substances in the reaction. 5. What is the ratio of the actual yield to the theoretical yield, multiplied by 100%? a. Avogadro yield c. percentage yield b. excess yield d. mole ratio 6. In the reaction A + B C + D, if the quantity of B is insufficient to react with all of A, a. B is the limiting reactant. c. no product can be formed. b. A is the limiting reactant. d. there is no limiting reactant. 7. After calculating the amount of reactant B required to completely react with A, then comparing that amount with the amount of B available, one can determine the a. rate of the reaction. c. energy released in the reaction. b. limiting reactant. d. pathway of the reaction. 8. The coefficients in a chemical equation represent the a. relative numbers of moles of reactants and products. b. masses, in grams, of all reactants and products. c. number of atoms in each compound in a reaction. d. number of valence electrons involved in the reaction. 9. A chemical reaction involving substances A and B stops when B is completely used. B is the a. primary reactant. c. limiting reactant. b. primary product. d. excess reactant.

4 10. In most chemical reactions, the amount of product obtained is a. less than the theoretical yield. c. more than the percentage yield. b. equal to the theoretical yield. d. more than the theoretical yield. 11. The correct mathematical expression for the relationship between percentage yield, actual yield, and theoretical yield is a. b. c. d. 12. The mole ratio of oxygen to tetraphosphorus decoxide in the reaction P 4 (s) + 5O 2 (g) P 4 O 10 (s) is a. 1:5 c. 1:1 b. 5:1 d. 4: Actual yield must be determined by a. estimation. c. calculations. b. experiments. d. theoretical yield. 14. In the reaction C + 2H 2 CH 4, what is the mole ratio of hydrogen to methane? a. 2:1 c. 2:4 b. 1:1 d. 1:2 15. For the balanced reaction CH 4 + 2O 2 2H 2 O + CO 2, calculate the percentage yield of carbon dioxide if g of methane react with excess oxygen to produce g of carbon dioxide. a. 83.8% c. 96.8% b. 89.1% d. 92.8% 16. When a chemical reaction is performed in industry, the chemical is often chosen as the excess reactant. a. least expensive and most abundant c. most expensive and most abundant b. most expensive and least abundant d. least expensive and least abundant 17. The substance not completely used up in a chemical reaction is known as the a. limiting reactant. c. excess product. b. excess reactant. d. limiting product. 18. All of the following values can be used to solve stoichiometry calculations EXCEPT a. molar mass. c. mole ratios. b. temperature. d. mass.

5 Problem (Each worth 3 points) 19. When 6.33 g sulfuric acid (H 2 SO 4 ) reacts with 5.92 g sodium hydroxide (NaOH), sodium sulfate (Na 2 SO 4 ) and water are formed. What mass of water was actually produced? Yes, you must write and balance the equation. 20. What mass in grams of 1-chloropropane (C 3 H 7 Cl) is produced if 400. g of propane react with excess chlorine gas according to the equation C 3 H 8 + Cl 2 C 3 H 7 Cl + HCl? 21. What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal react with excess water according to the chemical equation 2Na(s) + 2H 2 O 2NaOH(aq) + H 2 (g)? Compound Molar Mass g/mol Mg Na HCl H CH O H 2 O CO P P 4 O C 3 H 7 Cl C 3 H Cl NaOH H 2 SO Na 2 SO MgCl

6 Stoichiometry Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 DIF: II OBJ: ANS: A PTS: 1 DIF: III OBJ: ANS: C PTS: 1 DIF: III OBJ: ANS: D PTS: 1 DIF: I OBJ: ANS: C PTS: 1 DIF: I OBJ: ANS: A PTS: 1 DIF: II OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: A PTS: 1 DIF: I OBJ: ANS: C PTS: 1 DIF: II OBJ: ANS: A PTS: 1 DIF: I OBJ: ANS: C PTS: 1 DIF: II OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: A PTS: 1 DIF: III OBJ: ANS: A PTS: 1 DIF: III OBJ: ANS: A PTS: 1 DIF: II OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: B PTS: 1 DIF: I OBJ: PROBLEM 19. ANS: H 2 SO 4 + 2NaOH Na 2 SO 4 + 2H 2 O Answer: 2.33 g H 2 O PTS: 1 DIF: III OBJ: ANS: PTS: 1 DIF: III OBJ: ANS:

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