For the reaction given in Part A, How much heat is absorbed when 3.00mol of A reacts?

Express your answer numerically in kilojoules.

Part A (info):

Calculate the standard enthalpy change for the reaction

2A+B <=> 2C +2D

where the heats of formation are given in the following table:

Substance Delta H(f)

(kJ/mol)

A -247

B -399

C 219

D -507

Express your answer in kilojoules.

Answer: 317