Question

The total mass of ${10}^{22}$ molecular units of $CuS{O}_4.5H_{2}O$ is nearly

• A. 4.144 g
• B. 4.5 g
• C. 24.95 g
• D. 41.45 g

Answer 1

The correct option is A

4.144 g

$6.023\times {10}^{23}\to 240.6g$

${10}^{22}\to xg$

$x=\frac{240.6\times {10}^{22}}{6.023\times {10}^{23}}=4.144g$