What is the percent yield of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? The actual amount of CuS produced was 3.05.
Reaction: Na2S + CuSO4 ? Na2SO4 + CuS
A) 16.1%
B) 42.1%
C) 18.93%
D) 7.25%
E) not enough information
Answer: B