Ncert Exercises & Solutions

1.7 How much copper can be obtained from 100 g of copper sulfate ( ${CuSO}_{4}$ )?

1 mole of ${CuSO}_{4}$ contains 1 mole of copper.

Molar mass of ${CuSO}_{4}$ = (63.5) + (32.00) + 4(16.00)
= 63.5 + 32.00 + 64.00
= 159.5 g
159.5 g of ${CuSO}_{4}$ contains 63.5 g of copper.
⇒ 100 g of ${CuSO}_{4}$ will contain $\frac{63.5 \times 100 g}{159.5}$ of copper.
Amount of copper that can be obtained from 100 g $CuSO 4 = \frac{63.05 \times 100}{159.5}$
= 39.81 g