Question

Potassium magnate is a dark green crystalline substance whose composition is 40.2% K, 26.8% Mn and rest P. What is empirical formula?

Answer 1

$\%K=40.2\%Mn=26.8\%O=33$

Consider a $100$ $g$ sample

Moles of $K=\frac{100\times 40.2}{39\times 100}=1.03$

Moles of $Mn=\frac{100\times 26.8}{55\times 100}=0.5$

Moles of $O=\frac{100\times 33}{16\times 100}=2.06$

Formula $\Rightarrow K_{1}M{n}_{0.5}{O}_2\Rightarrow K_{2}Mn{O}_4$ (Empirical Formula)