a mixture of SO2 and O2 at 1atm in the mole ratio of 2:1 is passed thru a catalyst at 1170'C at a sufficient rate for the attainment of equilibrium the gas is suddenly chilled and analysed is found to contain 87% of SO3 by volume .calcu late Kp for the reaction. 2SO2 (g)+ O2(g)= 2SO3(g)
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