12. Consider the following processes: 2A-1/2 BC 3/2 B + 4C -- 2A + + 3D E + 4A - C AH"= 5 kJ/mol AH= -15 kJ/mol AH= 10 kJ/mol Calculate AHfor: C-E + 3D (2.5 Points) - 10 kl/mol O kl/mol - 20 kJ/mol 10 kJ/mol