Question

29.Calculate the molecular masses of methane CH4 and ammonia NH3.​

Answer 1

Answer:

molecular mass of CH4 is 16mol while the molecular mass of NH3 is 17mol

Answer 2

• Molecular mass is calculated by adding the individual atomic masses of the constituent elements.
• The molecular mass of methane is addition of the atomic mass of carbon and four times the atomic mass of hydrogen.

• The molecular mass of CH4 = atomic mass of carbon + 4 x atomic mass of hydrogen.

CH4 = 12 + 4x 1

= 12 + 4

= 16

Hence, the molecular mass of methane is 16g.

• The molecular mass of ammonia is the addition of the atomic mass of nitrogen and 3 times the atomic mass of hydrogen.

The molecular mass of NH3 = 14 + 3x1

= 17

Hence, the molecular mass of ammonia is 17g.