Chemistry Stoichiometry Calculation Practice Worksheet 1. Calculate the number of moles of NaOH that are needed to react with 500.0 g of H2SO4 according to the following equation: 2 NaOH Na2SO4 +  H2SO4 + 2 H2O ANS: 10.19 mol 2. Calculate the mass of NH3 that can be produced from the reaction of 125 g of NCl3 according to the following equation: 3 H2 O NH3 +  NCl3 + 3 HOCl ANS: 17.7 g 3. Identify the limiting reactant and determine the mass of CO2 that can be produced from the reaction of 25.0 g of C3H8 with 75.0 g of O2 according to the following equation: 5 O2 3 CO2 +  C 3 H8 + 4 H2O ANS: 61.9 g 4. How many grams of SO2 are produced when 152 g of CS2 react with 48.0 g of O2 according to the following equation: 3 O2 CO2 +  CS2 + 2 SO2 ANS: 64.1 g 1 Chemistry 5. When 50.0 g of MgCO3 react completely with H3PO4, as shown below,15.8 g of CO2 are produced. What is the percent yield for this reaction? 3 MgCO3  2 H3PO4 + Mg3(PO4)2 + 3 CO2 + 3 H2O ANS: 60.5% How many grams of P4O10 can be produced from the reaction of 52.9 g of KClO3 with excess phosphorous as shown below: KClO3 (s) + P4 (s)  6. P4O10 (s) + KCl (s) (unbalanced) ANS: 36.8 g Given the equation below, determine the limiting reactant, and calculate how many grams of Cu can be formed from the reaction of 18.1 g of NH3 and 90.4 g of CuO. 2 NH3 (g) + 3 CuO (s)  7. N2 (g) + 3 Cu (s) + 3 H2O (g) ANS: 72.2 g 2 Chemistry 8. When 50.0 g of MgCO3 react completely with H3PO4, as shown below,15.8 g of CO2 is produced. Determine the theoretical and percent yield for this reaction? Mg3(PO4)2 + 3 CO2 + 3 H2O  2 H3PO4 + 3 MgCO3 ANS: 26.1 g; 60.5% What mass of F2 is needed to produce 120.0 g of PF3, as shown, if the reaction has a 78.1% yield? P4 (s) + 6 F2 (g) 4 PF3  9. ANS: 99.6 g 3