Potassium chromate is isomorphous to potassium sulphate (K2SO4 ) and it is found to have 26.78% Cr. Calculate the at.wt. of Cr if at.wt. of potassium is 39.10.
Since potassium chromate and K2SO4 are isomorphs and thus molecular formula of potassium chromate is K2CrO4 . Let at. wt. of Cr be a, then formula wt. of K2CrO4
= 39.1 x 2 + a+16 x 4 = 142.2 + a
