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Question

Which is/are correct statements about 1.7 g of NH3?

A
It contains 0.3 mol H atom
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B
It contains 2.408×1023 atoms
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C
Mass % of hydrogen is 17.65%
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D
It contains 0.3 mol N atom
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Solution

The correct option is C Mass % of hydrogen is 17.65%
Moles of NH3=1.717=0.1
NH3 has 3 H atoms so,
Moles of H atom 0.1×3=0.3
Moles of N atom =0.1
Total number of atoms =0.1×4×6.02×1023
=2.408×1023
%H=molar mass of Hmolar mass of NH3×100
=3×117×100=17.65%

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