Consider the following reaction:
CaCO3(s)→CaO(s)+CO2(g).
Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.)
300K
1000K
1440K

Question

Consider the following reaction: 
CaCO3(s)→CaO(s)+CO2(g).
Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.)
300K
1000K
1440K

aaronq · Answer

so you first need to calculate $\sf \Delta S^o$ and  $\sf \Delta H^o$, then use:

$\sf \Delta G= \Delta H^o-T \Delta S^o$