20. The standard enthalpy of formation of NH3(g) at 25 C is 45.94 kJ/mol. Calculate the standard enthalpy of formation of NH3(g) at 300 C, knowing the following data on heat capacities (J*mol-1*K-1):
NH3(g) Cp=26.14 33.0*10-3T-3.043*10-6T2
N2(g) Cp=26.98 5.91*10-3T-0.338*10-6T2
H2(g) Cp=29.07-0.836*10-3T 2.011*10-6T2

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