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In the equilibrium,

2SO2(g) + O2 (g) 2SO3(g), the partial pressure of SO2, O2 and SO3 are 0.662, 0.101 and 0.331 atm respectively. What should be the partial pressure of oxygen so that the equilibrium concentration of SO2 and SO3 are equal.

(a) 0.4 atm                    (b) 1.0 atm

(c) 0.8 atm                    (d) 0.25 atm