5 moles of $\mathrm{SO}_{2}$ and 5 moles of $\mathrm{O}_{2}$ are allowed to react. At equilibrium, it was found that $60 \%$ of $\mathrm{SO}_{2}$ is used up. If the partial pressure of the equilibrium mixture is one atmosphere, the partial pressure of $\mathrm{O}_{2}$ is

• A

  $0.82 \mathrm{~atm}$
• B

  $0.52 \mathrm{~atm}$
• C

  $0.21 \mathrm{~atm}$
• Correct answer
  D

  $0.41$ atm

Solution

$\therefore \quad \mathrm{pO}_{2}=\frac{3.5 \times 1}{8.5}=0.41 \mathrm{~atm}$

Hence, the correct answer is option: 'D'.