Question

Calculate the molar mass of:

a) Ethyne

Answer 1

1. Molar mass is the sum of the masses of all the individual atoms present in a molecule or compound.
2. The atomic mass of carbon C is 12 u.
3. The atomic mass of carbon H is 1 u.
4. The atomic mass of nitrogen is 14 u.
5. The atomic mass of phosphorous is 31 u.

a) Ethyne

The chemical formula of ethyne is ${\mathrm{C}}_2{\mathrm{H}}_2$

$\mathrm{Molar}\mathrm{mass}\mathrm{of}\mathrm{ethyne}\left({\mathrm{C}}_2{\mathrm{H}}_2\right)\mathrm{is}=(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{carbon})\mathrm{x}2+(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{hydrogen})\mathrm{x}2$

$=(12\mathrm{x}2)+(1\mathrm{x}2)$

$=24+2$

$=26$

The molar mass of ethyne C₂H₂ is 26 g mol^-1.