Calculate the percentage composition of each element in Potassium chlorate, KClO₃.

Urea is a very important nitrogenous fertilizer. Its formula is CON₂H₄. Calculate the percentage of carbon in urea.

(C= 12, O = 16, N = 14 and H = 1)

Calculate amount of Nitrogen in one bag (50 kg) of Urea.

Calculate percentage of platinum in [(NH₄)₂ PtCl₆]. Ammonium chloride platinate in nearest whole number.