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N2H4
100gm of the compound contains 12.5 gH and 100-12.5= 87.5gN
the atomic masses of H and N are 1g/ mol and 14g/mol respectively
the number of moles of H=12.5g/1g/mol
= 12.5 mol
the number of moles of N=87.5g/ 14g/ mol
= 6.25 mol
the mol ratio N:H = 6.25 :12.5= 1:2
hence empirical formula of of the compound is NH2.
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