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Question

Question 37
Which has more number of atoms?
100g on N2 or 100 g of NH3

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Solution

Molar mass of N2=2×14=28 g
28 g of N2 has number of molecules =6.022×1023
100 g of N2 has number of molecules =6.022×1023×10028=2.1×1024
Atoms in 100 g of N2=2.1×1024×2
=4.2×1024 atoms
Similarly, molar mass of NH3=14+3×1=17 g
17 g NH3 has number of molecules =6.022×1023
100 g NH3 has number of molecules =6.022×1023×10017=3.54×1024
Atoms in 100 g of NH3=3.54×1024×4=1.416×1025
Thus, 100 g of NH3 has more number of atom.


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