Question

Calculate molecular mass of H2 and NH3 (At. mass of H=1u , N=14u)

Answer 1

Molecular mass calculation

• The sum of the atomic mass of atoms present in a molecule is termed as molecular mass.
• It is calculated by adding the atomic mass of all the atoms present in the molecule.

Molecular mass of hydrogen ($H_2$):

• Hydrogen molecule has 2 hydrogen atom it and the formula is $H_2$.
• The atomic mass of hydrogen atom is 1u.

• As $H_2$ has 2 hydrogen atoms, the molecular mass of hydrogen is calculated as 1 u + 1 u = 2 g/mol.

Molecular mass of Ammonia ($NH_3$)

• Ammonia is a molecule that has 1 nitrogen atom and 3 hydrogen atom.
• The atomic mass of nitrogen is 14u and hydrogen is 1u.
• The molecular mass of ammonia is calculated as 14u + 3(1) = 14 u + 3 u = 17 g/mol.

Thus the molecular mass of $H_2$ and $NH_3$ is calculated as 2 g/mol and 17 g/mol respectively.

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Answer 2

Answer:

17 g/mol

Explanation:

The atomic mass of nitrogen is 14u and hydrogen is 1u. The molecular mass of ammonia is calculated as 14u + 3(1) = 14 u + 3 u = 17 g/mol