Potassium chromate is isomorphous to potassium sulphate `(K_(2)SO_(4))` and is found to contain 26.78% chromium. Calculate the atomic mass of chromium (K=39.10)

Explanation

Since, the formula of potassium sulphate is `K_(2)SO_(4)`, so the formula of potassium chromate should be `K_(2)CrO_(4)` as it is isomorphous to `K_(2)SO_(4)`.
If the atomic mass of chromium is A, then formula mass of potassium chromate should be
`=2xx39.1+A+64=(142.2+A)`
% of chromium `=(A)/((142.2+A))xx100`
So, `(100A)/((142.2+A))=26.78`
`100A=26.78(142.2+A)`
or `A=(26.78xx142.2)/(73.22)=52.00`