CHM 2045C Module Five Sample Exam
Module Four-Part K Excess-Limiting Reagent Problem 4 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 4 points
A laboratory manual calls for 13.0 grams of butanol, 21.6 grams of sodium bromide, and 33.8 grams of 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 are the theoretical yield and percent yield of this reaction?