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#### A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is Option 1) 1.8 atm Option 2) 3 atm Option 3) 0.3 atm Option 4) 0.18 atm

As we learnt in

Equilibrium constant in gaseous system -

For equilibrium involving gases, it is usually more convenient to express the equilibrium constant in terms of partial pressure.

- wherein

The ideal gas equation is written as

Initial pressure                     0.5 atm         0                  0

Pressure at equilibrium       0.5-x                              2x

Total Pressure =  0.5 - x + 2x = 0.8

x = 0.3

Option 1)

1.8 atm

This is correct.

Option 2)

3 atm

This is incorrect.

Option 3)

0.3 atm

This is incorrect.

Option 4)

0.18 atm

This is incorrect.