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The standard molar internal energy of formation of N2O5(g) is 17.433 kJ/mol at 298 K. What is the standard molar enthalpy of formation of N2O5(g) at the same temperature? 1. 11.24 kJ/mol 2. None of the other answers is correct within 2% 3. 7.921 kJ/mol 4. 19.07 kJ/mol 5. 4.955 kJ/mol