Plz explain. this ... ou carry two marks each. the heat ofmation of mgo at 280 k

OU Carry two marks each. The heat of formation of MgO at 300 K and 1 bar pressure is -600.60 kJ mol. The free energy (in kJ mol-l) of formation of MgO at 280 K is integer) Q.51 (Round off to nearest Given: In the range 280-300 K, the constant pressure heat capacities (CP) and molar entropies (Sm) are: Mg O2 MgO CP (in J mol-l K-l) 24.9 29.4 27.0 Sm (in J mol' K-l) 0 205.2 0