Question

Which one is heavier, 1 mole of ${\mathrm{CO}}_2$ or 1 mole of $\mathrm{CO}$?

Answer 1

Part 1: Molecular mass:-

The collective mass of all the atoms that are present in the molecule altogether is called the molecular mass of the compound.

Part 2: 1 mole of ${\mathrm{CO}}_2$ heavier than 1 mole of $\mathrm{CO}$

Molecular mass of 1 mole of ${\mathrm{CO}}_2$ $=12+(16\times 2)=12+32=44\mathrm{amu}$

Molecular mass of 1 mole of $\mathrm{CO}$ $=12+16=30\mathrm{amu}$

Hence we can see that the molecular mass of 1 mole of ${\mathrm{CO}}_2$ is greater.

Therefore, 1 mole of ${\mathrm{CO}}_2$ is heavier than 1 mole of $\mathrm{CO}$.