An organic compound on analysis gave C = 48 g, H : 8 g and N : 56 g. Volume of 1.0 g of the compound was found to be 200 ml at NTP. Molecular formula of the compound is

Empirical formula = CH2NEmpirical formula mass = 28Now, 200 ml of compound = 1 g22400 ml  of compound  1200 × 22400 = 112g ; n = Mol. of massEmp. formula mass  = 11228=4 Therefore, Molecular formula = CH2N4 = C4H8N4.