Question

What is the significance of percentage compo­sition?

Answer 1

Percentage composition:

The ratio by mass of each element present in the compound is called its percentage composition.

The formula of percentage composition:

$\%\mathrm{of}\mathrm{an}\mathrm{element}\mathrm{by}\mathrm{mass}\mathrm{present}\mathrm{in}\mathrm{compound}=\frac{\mathrm{Mass}\mathrm{of}\mathrm{an}\mathrm{element}\mathrm{in}\mathrm{one}\mathrm{mole}\mathrm{in}\mathrm{the}\mathrm{compound}}{\mathrm{Gram}\mathrm{molecular}\mathrm{mass}\mathrm{of}\mathrm{the}\mathrm{compound}}\times 100$

Significance of percentage composition:

1. It helps to determine the mass of each element present in 100g of a known compound.
2. It also helps to identify the formula of an unknown compound.