Consider the following reaction:
2A + B → 3C + D
3)0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?
A)75 %
B)67 %
C)89 %
D)50 %
E)100 %

Question

Quizplus · Accepted Answer

To calculate the theoretical yield of C, we need to find the limiting reactant. 
From the balanced equation, we can see that 1 mol of B is required for 2 mol of A to react. Therefore, 2.0 mol B is the limiting reactant.
Using the stoichiometry of the balanced equation, we can calculate the theoretical yield of C: 
2 mol B x (3 mol C/1 mol B) = 6 mol C
Since the actual yield is 4.0 mol C, the percent yield is: 
(actual yield/theoretical yield) x 100% = (4.0/6.0) x 100% = 66.7%, which is closest to choice C (89%).

Consider the Following Reaction