27. Calculate the heat of formation of MgCO3(s) from MgO(s) and CO2 using the following data:
C(graphite) O2(g)=CO2(g)-393.5 kJ/mol
Mg(s) 1/2O2(g)=MgO(s)-601.7 kJ/mol
Mg(s) C(graphite) 3/2O2(g)=MgCO3-1113.0 kJ/mol

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