What is the standard enthalpy of ormation of liquid diethylamine, (CH3CH2)2NH? N2O(g) + 8CH (9) 2(CH3CH2)2NH() + 5H20(1) AH = -1103 kJ N20s(9) AHf (kJ/mol) +11.3 CH (9) AHf (kJ/mol) -74.9 H2O(1) AHf (kJ/mol) -285.8 a. +421 kJ/mol b. +131 kJ/mol c. -131 kJ/mol d. -421 kJ/mol e. -1452 kJ/mol