Question 7: Stoichiometry (3 points) Unit 5
a. How is stoichiometry used to calculate amounts of substances in a chemical reaction? (1 point)

b. Use the balanced equation to answer the following questions. (2 points)
CuSO4(aq) + 2NaOH(aq) Cu(OH)2(s) + Na2SO4(aq)

i. What is the ratio of moles of CuSO4 to moles of NaOH? (.5 point)

ii. If 638.44 g CuSO4 reacts with 240.0 NaOH, which is the limiting reagent? (.5 point)

iii. Use the limiting reagent to determine how many grams of Cu(OH)2 should precipitate out in the reaction. (.5 point)

iv. If only 174.6 g of Cu(OH)2 precipitate were actually collected from the reaction, what would the percent yield be? (.5 point)