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Question

A hydride of nitrogen contains 87.5 percent by mass of nitrogen .determine the empirical formula of this compound.

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Solution

Dear student,

Constituents Symbol %age Atomic mass moles of the element = %age/at. mass (relative no. of moles) Simplest molar ratio Simplest whole no. ratio
Nitrogen N 87.5 14 87.5/14=6.25 6.25​/6.25​=1 1
Hydrogen H 12.5 1 12.5/6.25=4.34 12.5/6.25=2 2
Thus, empirical formula (NH2)

But nitrogen forms trivalent compound so hydride of nitrogen by 87.5 by mass % is N2H4 ( dimer of
NH2).

Regards





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