Question

A sample of impure silver (1.5 g) is heated with sulfur to form $A{g}_{2}S$. The mass of $A{g}_{2}S$ formed was 0.124 g. What will be the percentage yield of silver sulfide?

• A. 6.41%
• B. 7.20%
• C. 8.27%
• D. 10.8%

Answer 1

Answer: (B)

7.20%

A desired balanced chemical equation is:

$\underset{2\times 108=216g}{\underset{2mol}{2Ag}}+S\to \underset{248g}{\underset{1mol}{A{g}_{2}S}}$

Amount of $A{g}_{2}S$ that can be formed from $1.5g$ of silver:

$=\frac{248}{216}\times 1.5=1.722/g$

% yield of $A{g}_{2}S=\frac{0.124}{1.772}\times 100=7.2$ %