#13 in most chemical reactions the amount of product obtained is a. equal to the theoretical yield b. less than the theoretical yield c. more than the theoretical yield

#14 in the chemical reaction, Mg + 2HCI->MgCl^2+H^2 how many moles of HCI are needed to completely react with 3.5 moles of Mg? a. 2 b. 3 c. 3.5 d. 7

 

16. How many atoms of oxygen (O2) are produced when a sample of 20 g of oxygen is created by the electrolysis of water? a. 1.46 x 1023 atoms of O b. 3.76 x 1023 atoms of O c. 4.88 x 1023 atoms of O d. 1.20 x 1025 atoms of Oz 17. What coefficients correctly balance the reaction: _CH + O2 __H2O+ __CO. a. 1, 1, 1, 1 b. 1, 2, 2, 1 c. 1, 2, 1, 2 d. 1, 2, 1, 1 18. For the reaction represented by the equation CH4 + 0 HO+CO, if 1000. g of methane reacts with excess oxygen to produce 2300. g of carbon dioxide, what is the actual yield of carbon dioxide? a. 83.8 g CO b. 1000 g CO c. 2300 g CO d. 2742 g CO 19. For the reaction represented by the equation CH, + 91 HO+CO, if 1000. g of methane reacts with excess oxygen to produce 2300. g of carbon dioxide, what is the theoretical yield of carbon dioxide? a. 83.8 g CO b. 1000 g CO c. 2300 g CO d. 2742 g CO 20. For the reaction represented by the equation CH + O2 HO + CO2, calculate the percentage yield of carbon dioxide if 1000. g of methane react with excess oxygen to produce 2300. g of carbon dioxide. a. 83.88% b. 89.14% c. 92.76% d. 96.78%