How many kilo-joules are associated with the formation of 2 moles of HBr(g)?

Answer 1

The energy is -72,26 kJ.

Answer 2

The standard enthalpy of formation of HBr(g) is -36.2 kJ/mol. For 2 moles of HBr(g), the total energy associated with its formation would be 2 * -36.2 kJ/mol = -72.4 kJ.