Limiting And Excess

QUIZ A
CHEMISTRY 20
Limiting and Excess Stoichiometry
1. Adipic acid, H2C6H8O4, is a raw material used for the production of nylon. It is made commercially by a controlled reaction between cyclohexane, C6H12, and O2:
2C6H12 + 5O2  2H2C6H8O4 + 2H2O
(a) Assume that you carry out this reaction starting with 25.0 g of cyclohexane and 25.0 g of O2 (g). What is the theoretical yield of adipic acid?

(b) If you obtain 33.5 g of adipic acid from your reaction, what is the percent yield of adipic acid?

2. Part of the SO2 that is introduced into the atmosphere ends up being converted to sulfuric acid, H2SO4. The net reaction is
2SO2(g) + O2(g) + 2H2O(l)  2H2SO4(aq)
What amount, moles, of H2SO4 can be formed from 5.0 mol of SO2, 1.0 mol of O2, and an unlimited quantity of H2O?

3. Consider the following reaction:
2Na3PO4(aq) + 3Ba(NO3)2(aq)  Ba3(PO4)2(s) + 6NaNO3(aq)
Suppose that a solution containing 3.50 g of Na3PO4 is mixed with a solution containing 6.40 g of Ba(NO3)2.
(a) How many grams of Ba3(PO4)2 can be formed?

(b) Determine the mass of excess remaining.