CHM 1025C Module Five Sample Test

Module Five-Part K Excess-Limiting Reagent Problem 10 points

How many grams of Calcium phosphate can be made according to the reaction (unbalanced):

CaCl₂ + K₃PO₄ ----> Ca₃(PO₄)₂ + KCl

by mixing a solution of 5.00 grams of CaCl₂ with another containing 8.00 grams of Potassium phosphate?

Module Four-Part L Impure Reagents/% Yield Stoichiometry Problem 5 points

A laboratory manual calls for 13.0 grams of butanol reactant in excess sodium bromideand sulfuric acid as reactants in this reaction:

C₄H₉OH + NaBr + H₂SO₄ ------> C₄H₉Br + NaHSO₄ + H₂O

A student following these directions obtains 16.8 grams of butyl bromide (C₄H₉Br). What is the theoretical yield and the percent yield of this reaction?