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Initially a vessel is charged at 1000K with SO3 at a partial pressure of 0.5atm. At equilibrium the SO3 partial pressure is 0.2atm. Calculate the value of Kp at 1000K. 2SO3->2SO2+O2

My answer:
0.5-0.2=0.3atm
SO2=0.3atm*2/2mol= 0.3
O2=0.3atm*1/2mol=0.8
Therefore 0.8-0.3=0.5

Tbook answer: 0.338

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