Question

Calculate the volume of $6.8\text{g}$ of $N{H}_3$ at standard temperature and pressure.

• A. $8.05\text{L}$
• B. $8.22\text{L}$
• C. $8.96\text{L}$
• D. $7.96\text{L}$

Answer 1

The correct option is C $8.96\text{L}$

Number of moles of $N{H}_3$ = $\frac{\text{given mass}}{\text{molar mass}}=\frac{6.8}{17}=0.4$ moles
1 mole of a gas occupies $22.4\text{L}$ at standard temperature and pressure.
0.4 moles of a gas will occupy $\frac{22.4}{1}\times 0.4=8.96\text{L}$