Moles of N2 = mass / molar mass
= 9.79 / 28
= 0.35
Moles of H2 = 3* moles of N2
= 3*0.35
= 1.05
Number of molecules = avagadro number * moles
= 6.022*10^23 * 1.05
= 6.32*10^23 molecules
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