Q. 5 moles of SO2 and 5 moles of O2 are allowed to react. At equilibrium, it was found that 60% of SO2 is used up. lf the partial pressure of the equilibrium mixture is one atmosphere. the partial pressure of O2 is?

1. 0.21 atm
2. 0.41 atm
3. 0.82 atm
4. 0.52 atm