Question

Calculate ?G?rxn for the following reaction:

CaCO3(s)?CaO(s)+CO2(g).

Use the following reactions and given ?G?rxn values:

Ca(s)+CO2(g)+12O2(g)?CaCO3(s), ?G?rxn= - 734.4 kJ

2Ca(s)+O2(g)?2CaO(s), ?G?rxn= - 1206.6 kJ

Answer should be in kJ and be in one decimal place.