Following data is given for the reaction: CaCO3(s)→CaO(s)+CO2(g) ΔfH⊝[CaO(s)]=−635.1kJmol−1 ΔfH⊝[CO2(g)]=−393.5kJmol−1 ΔfH⊝[CaCO3(s)]=−1206.9kJmol−1 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⊝=178.3kJmol−1.
The reaction is endothermic. Hence, according to Le Chatelier’s principle, reaction will proceed in forward direction on increasing temperature.