Question

A vessel contains $16\, g$ of hydrogen and $128\, g$ of oxygen at standard temperature and pressure. The volume of the vessel in $cm ^{3}$ is :

• A. $72 \times 10^{5}$
• B. $32 \times 10^{5}$
• C. $27 \times 10^{4}$
• D. $54 \times 10^{4}$

Answer 1

Answer: (C)

No of moles of $H _{2}=8$ moles
No of moles of $O _{2}=4$ moles
Total moles $=12$ moles
At STP 1 mole occupy $=22.4 \ell=22.4 \times 10^{3} cm ^{3}$
12 moles will occupy $=12 \times 22.4 \times 10^{3} cm ^{3}$ $\approx 26.8 \times 10^{4} cm ^{3}$