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Grade 11Engineering Entrance Exams

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 0.18 atm B 1.8 atm C 3 atm D 0.3 atm

Profile image of Jayant Kumar
12 Years agoGrade 11
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2 Answers

Profile image of Saurabh Koranglekar
6 Years ago
Dear student

The answer is option b

Regards
Profile image of Vikas TU
6 Years ago
initially        0.5    0             0
at eq'm     0.5-x    0           2x
As solids do not contribute to pressure.
Given total pressure= 0.5-x+2x=0.8
x=0.3
Thus 
pco2 = 0.5-0.3 = 0.2 
pco = 2*0.3 
So eq'm constant will be:
kp = p(co)^2 / (pco2) 
= 1.8 

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