Portage Learning Chem 219-HW 7 Stoichiometry

1. One way to produce hydrogen gas is by reacting zinc with hydrochloric acid according to the following reaction. How many grams of H2 can be produced with 10.0 g of Zn, MW (g/mol) Zn = 65.38, H2 = 2.02. 2. CaCO3 can be used to neutralization of excess stomach acid according to the following reaction. For each gram (1.00 g) of CaCO3, how many grams of HCl can be eliminated? MW: CaCO3 =100.1 g/mol, HCl = 36.46 g/mol. CaCO3 + 2 HCl ->CaCl2 + H2O + CO2 3. For a given reaction, the theoretical yield of a product is 72.6 g, and the actual yield is 69.3 g. What is the percent yield of the reaction? 4. What is the percent yield of H2O in the following reaction if 10.0 g (NH4)2Cr2O7 produce 2.50 of H2O? MW (g/mol) (NH4)2Cr2O7 = 252.1, H2O = 18.02 (NH4)2Cr2O7 -> N2 + 4 H2O + Cr2O3 5. Given the following reaction that has a 92.5% yield, how many grams of CuSO4 are required to produce 75.0 g of copper? MW: CuSO4 = 159.6 g/mol, Cu = 63.55 g/mol Fe + CuSO4 -> Cu + FeSO4