Question

4. How much copper can be
obtained from 100g of copper
sulphate (CuSO4)
O 39.819
O 429
0 369
O 45g
Required​

Answer 1

Given :

Mass of copper sulphate = 100g

To Find :

How much copper can be obtained from the given amount of copper sulphate.

Solution :

■ First of all we need to find molar mass of copper sulphate.

In order to find molar mass, we need to know atomic mass of each element.

❇ Atomic mass of Cu : 63.5 g/mol

❇ Atomic mass of S : 32 g/mol

❇ Atomic mass of O : 16 g/mol

We know that the mass of one mole of a

substance in grams is called molar mass, which is numerically equal to atomic/molecular/formula mass expressed in u$.$

⧪ Molar mass of CuSO₄ :

• Cu + S + 4(O)
• 63.5 + 32 + 4(16)
• 95.5 + 64
• 159.5 g/mol

So we can say that,

159.5g of CuSO₄ contains 63.5g of Cu

∴ 100g of CuSO₄ will have

• 100 × 63.5/159.5
• 6350/159.5
• 39.819 g of Cu

∴ (1) is the correct answer!