Question

Copper(l) sulfide can react with oxygen to produce copper metal by the reaction cu2s + o2 => 2cu + so2. if 5.00 g of cu2s is used, then what is the theoretical yield of cu?

a. 10.0 g
b. 1.99 g
c. 1.00 g
d. 5.00 g
e. 3.99 g

Answer 1

n=m/M
n(Cu2S)=5/(63.55*2+32.06)=5/159.16=0.0314149
n(cu)=n(cu2s)*2=0.0628298
m(cu)=0.0628298*63.55=3.99
Answer 3.99 gram cu