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Question

In the preparation of quick lime from limestone, the reaction is:

CaCO3(s)CaO(s)+CO2(g)
Experiments carried out between 850C and 950C led to a set of Kp values fitting in empirical equation ln Kp=7.2828500T, where T is the absolute temperature. If the reaction is carried out in quiet air, what minimum temperature would be predicted from this equation for almost complete decomposition of lime?

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Solution

For complete decomposition of lime, the value of Kp must be 1
lnKp=7.2828500T
Kp=1
7.282=8500T
T=1167 K (minimum temperature for complete reaction)
In oC=1167273=894oC

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