Question

A particular compound contains only nitrogen and hydrogen. The percentage of nitrogen in The compound is `87.5%`. Further, 96 g of the compound contains `18 xx 10^(23)` molecular of the substance. Find out the molecular formula of the compound.

Answer 1

Number of moles of the given substance `=(18 xx 10^(23))/(6 xx 10^(23)) = 3`
Weight of compound = 96
Gram molecular mass of the compound = `96/3 = 32 `g
` % " of " N_(2) = 87.5%`
Number of nitrogen atoms in 1 molecule of the compound = `(87.5 xx 32)/(100 xx 14) = 2`
Similarly number of hydrogen atom in 1 molecule of the compound = `(12.5 xx 32)/(100 xx 2) = 4`
Molecular formula is `N_(2)H_(4)`