Question

Define the following term:

Percentage composition of a compound

Answer 1

Percentage composition of a compound:

• The percentage composition of a compound is the percentage by weight of each element present in the compound.
• Percentage of an element in a chemical compound is the number of parts by weight of it present in $100$ parts by weight of the compound.

Percentage by mass of X is equal to:

$$\begin{gathered} =\frac{\mathrm{Mass}\mathrm{of}\mathrm{X}}{\mathrm{Mass}\mathrm{of}\mathrm{sample}}\times 100 \\ =\frac{\mathrm{Number}\mathrm{of}\mathrm{parts}\mathrm{by}\mathrm{weight}\mathrm{of}\mathrm{the}\mathrm{element}}{\text{Molecular mass of the compound}}\times 100 \end{gathered}$$