Question

1.5 gram of divalent metal displaced 4 gram of copper atomic weight of 64 from a solution of copper sulphate the atomic weight of metal is

Answer 1

Its zinc. At. Weight 65
Its a displacement reaction
Zn+cuso4 gives znso4+cu

Answer 2

Answer: The atomic weight of metal is 24 g/mol.

Explanation:

$CuSO_4(aq)+M^{2+}(aq)\rightarrow MSO_4(aq)+Cu^{2+}(aq)$

Moles of Cu =$\frac{\text{mass of copper}}{\text{atomic mass of copper}}=\frac{4 g}{64 g/mol}=0.0625 moles$

According to reaction, 1 mole of $CuSO_4$ is reacts with 1 mole of $M^{2+}$ metal then 0.0625 moles of $CuSO_4$ react with =$\frac{1}{1}\times 0.0625 mol$ of $M^{2+}$ metal

Moles of $M^{2+}=0.0625 moles=\frac{\text{mass of metal}}{\text{atomic mass of metal}}$

Atomic mass of metal :

$\frac{\text{mass of metal}}{\text{moles of metal}}=\frac{1.5 g}{0.0625}=24 g/mol$

The atomic weight of metal is 24 g/mol.