A sample of gaseous SO 3 was introduced into anevacuated flask so that the press

Question

A sample of gaseous SO3 was introduced into anevacuated flask so that the pressure of pure SO3 wouldbe 0.5800 atm at 522 K.
But,SO3 decomposes to gaseous SO2 andO2. At equilibrium the TOTAL pressure in theflask was measured at 0.7308 atm. Calculate Kp atthis temperature for the reaction SO3(g) SO2(g) + 1/2 O2(g) Base your calculations on the reaction as written above A sample of gaseous SO3 was introduced into anevacuated flask so that the pressure of pure SO3 wouldbe 0.5800 atm at 522 K.
But,SO3 decomposes to gaseous SO2 andO2. At equilibrium the TOTAL pressure in theflask was measured at 0.7308 atm. Calculate Kp atthis temperature for the reaction Base your calculations on the reaction as written above

Explanation / Answer

The initial pressure of SO3(g) is0.5800 atm                 SO3(g) SO2(g) + 1/2O2(g)         I    0.58             0             0                  C     -x                x             (1 /2) x          E    0.58-x          x              (1 /2) x       Given that at equilibrium total pressure = 0.7308 atm           0.58-x + x + (1/2) x = 0.7308        x =0.3016 atm           Kp = (x) (x /2) / (0.58-x)                  = 0.163

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