The answer is -4,346. Please show the steps how to do this question.

4 moles A and 9 moles B are introduced into a reactor at 1 atm and 50 C. The reaction happens base on the following equation :

A+B=2C H (1atm, 25 C)=-1,340 kJ

At the end of the reaction the temperature of remaining species in the reactor are 71 C.

Calculate the total change of enthalpy in this system in kJ.

Cp,a = 1 KJ/mol.K

Cp,b = 2 KJ/mol.K

Cp,c = 3 KJ/mol.K

Note: A will be fully consumed. B is in excess and some of it will remain at the end of the reaction.

Report your answer up to 2 decimal points. Do not truncate any intermediate steps, but only the final result.