The equilibrium constant kp for the reaction 2SO2+O2⇔2SO3 is 2.5 atm−1 . What would be the partial pressure of O2, if the equilibrium pressures of SO2 and SO3 are equal?
A
304 mm
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B
30.4 mm
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C
0.04 mm
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D
760 mm
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Solution
The correct option is A 304 mm The equilibrium reaction is 2SO2+O2⇔2SO3 The expression for the equilibrium constant is Kp=[SO3]2[SO2]2[O2] But [SO3]=[SO2] and Kp=2.5atm−1 Substitute the values in the above expression. 2.5=[SO3]2[SO2]2[O2]=1[O2] Thus [O2]=0.4=0.4×760=304mm