Question

$2.8g$ of calcium oxide prepared by heating limestone were found to contain $0.8g$ of oxygen. When one gram of oxygen was treated with calcium, $3.5g$ of calcium oxide was obtained. Show that the results illustrate the law of definite proportions.

Answer 1

$\underset{m}{2.8gm}$ of $CaO⟶\underset{n}{0.8gm}$ of Oxygen

$\underset{x}{1.0gm}$ of $O_2⟶\underset{y}{3.5gm}$ of $Ca$

According to the law of definite proportions

$\Rightarrow \frac{m}{n}=\frac{x}{y}$

$\Rightarrow \frac{2.8}{0.8}=\frac{3.5}{1}$

$\Rightarrow 3.5=3.5$