Question

Calculate the number of moles in 2.2g of ${\mathrm{CO}}_2$.

Answer 1

1. Given mass = 2.2g
2. Molecular weight of carbon dioxide (CO₂) = $12+(2\times 16)$= 44 u
3. Gram molecular mass of ${\mathrm{CO}}_2$, M = 44 g
4. No. of moles, n = $\frac{w}{M}$ = $\frac{2.2}{44}$ = 0.05 moles
5. Therefore, the number of moles in 2.2g of ${\mathrm{CO}}_2$ is 0.05 moles.