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Question

Following data is given for the reaction: CaCO3(s)CaO(s)+CO2(g)
ΔfH[CaO(s)]=635.1kJ mol1
ΔfH[CO2(g)]=393.5kJ mol1
ΔfH[CaCO3(s)]=1206.9kJ mol1
Predict the effect of temperature on the equilibrium constant of the above reaction.

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Solution

ΔrH=ΔfH[CaO(s)]+ΔfH[CO2(g)]ΔfH[CaCO3(s)]
ΔfH=178.3kJ mol1.
The reaction is endothermic. Hence, according to Le Chatelier’s principle, reaction will proceed in forward direction on increasing temperature.

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