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‘X’ moles of CaCO3 is taken in a closed vessel. At 819oC and 1 atmosphere, equilibrium is attained for the reaction CaCO3(s)⇌ CaO(s)+CO2(g). Equilibrium concentration of CO2 is 189.6M . Kp for the reaction is (assume ideal behaviour of CO2)

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a

1 atmosphere

b

2 atmospheres

c

0.5 atmospheres

d

4 atmospheres

answer is A.

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Detailed Solution

∵ Equilibrium is attained at 1 atm. ∴Kp=PCO2=1 atm ;Alternate methodFor an ideal gasPV = nRTPRT=nVP=189.6×0.0821×1073P = 1 atmosphere

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