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Question

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:

A
1.8 atm
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B
3 atm
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C
0.3 atm
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D
0.18 atm
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Solution

The correct option is A 1.8 atm
CO2+Cgraphite2CO
Pinitial 0.5 atm 0
Pfinal (0.5x)atm 2x atm
Total P at equilibrium 0.5x+2x=0.5+x atm
0.8=0.5+x
x=0.80.5=0.3 atm
Now Kp=(PCO)2PCO2
Kp=(2×0.3)2(0.50.3)=(0.6)2(0.2)=1.8 atm

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