How will you calculate the percentage of an element by mass present in a compound?

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Solution

Percentage composition:
Percentage composition determines the amount of elements present in the compound.
It is calculated by the ratio of the mass of an element in one mole of the compound and the molecular mass of the compound.
For example, calculate the percentage composition of Carbon (C) in Carbon dioxide.
The molecular mass of Carbon dioxide $({CO}_{2})$ = 44 u
The atomic mass of Carbon (C) = 12 u
$\begin{array}{rcl} Percentage of carbon & = & \frac{Mass of carbon in 1 mol of Carbon dioxide}{Mass of carbon dioxide} \times 100 \\ = & \frac{12 u}{44 u} \times 100 \\ = & 27.27 % \end{array}$

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_{8}^{16} A

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