Question

find the molecular mass of NH3​

Answer 1

The atomic masses of N and H are 14 g/mol and 1 g/mol respectively. The molecular weight of ammonia is 14+3(1)=17 g/mol.

Convert unit from g to kg

17 g/mol×

1000 g

1 kg

=0.017 kg/mol

1 mole of ammonia weighs 0.017 kg and contains Avogadro's number ( 6.023×10

23

) of molecules.

Molecular mass of an ammonia molecule =

6.023 ×10

23

molecules/mol

0.017 kg/mol

=2.82×10 −26kg

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Answer 2

Atomic mass of N=14

Atomic mass of H=1

Molecular mass of NH3= 14+1×3

= 14+3

=17 u

Hope it helps.......