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Question

In the reaction, C(s)+CO2(g)2CO(g), the equilibrium pressure is 12atm. If 50% of CO2 reacts, calculate Kp

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Solution

Let P atm be the initial pressure of CO2.
50% (or P×50100=0.5P atm) of CO2 reacts to reach equilibrium.
P×50100=0.5P atm of CO2 remains at equilibrium.
2×0.5P=P atm of CO is formed.
Total pressure at equilibrium =0.5P+P=1.5P=12 atm
P=121.5=8 atm
PCO2=0.5P=0.5×8=4 atm
PCO=P=8 atm
Kp=P2COPCO2
KP=824
KP=16 atm.

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