Question

Calculate the molecular weight of the following

Hydrated copper sulphate ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$.

Answer 1

Definition of molecular weight

Molecular weight, also called molecular mass, is the mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12. It is calculated in practice by summing the atomic weights of the atoms making up the substance's molecular formula.

Calculation

Given, $\mathrm{Cu}=64,\mathrm{S}=32,\mathrm{O}=16\&\mathrm{H}=1$

The molecular weight of hydrated copper sulfate = $64+32+4\times 16+5\{2\times 1+16\}=250\mathrm{amu}$

The molecular weight of hydrated copper sulfate ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ is 250 amu.