Example 1 - Empirical Formula

Tentukan formula empirik sebatian yang mempunyai peratus komposisi Mg: 20.2%, S: 26.6%, O: 53.2%. [Jisim atom relatif: Mg = 24; S = 32; O = 16]

Jawapan

Unsur	Mg	S	O
Peratus	20.2%	26.6%	53.2%
Jisim dalam 100g	20.2g	26.6g	53.2g
Bilangan mol	$$\begin{array}{l}\frac{20.2}{24}\\ =0.8417\text{mol}\end{array}$$	$$\begin{array}{l}\frac{26.6}{32}\\ =0.8313\text{mol}\end{array}$$	$$\begin{array}{l}\frac{53.2}{16}\\ =3.325\text{mol}\end{array}$$
Nisbah ringkas	$$\begin{array}{l}\frac{0.8417}{0.8313}\\ =1\end{array}$$	$$\begin{array}{l}\frac{0.8313}{0.8313}\\ =1\end{array}$$	$$\begin{array}{l}\frac{3.325}{0.8313}\\ =4\end{array}$$

Formula empirik sebatian ini ialah MgSO₄