Question

A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. the density of the compound relative to hydrogen is 16. the molecular formula of the compound is:

Answer 1

The answer is N2H4 , please check it might help

Answer 2

The empirical formula for the compound comes out to be NH2.

Thus empirical formula mass = 14 + 2* 1 = 16

Calculation of molecular formula

n = Molecular mass/Empirical formula mass

Now,

molecular mass = 2 * density

= 2* 16 = 32

Therefore,

n = 32/16 = 2

Thus molecular formula will be = Empirical formula * n

molecular formula = NH2 * 2 = N2H4

ANS. N2H4