Calculate the standard enthalpy change for the reaction
2A+B⇌2C+2D2A+B⇌2C+2D
where the heats of formation are given in the following table:
Substance ΔH∘fΔHf∘
(kJ/molkJ/mol)
AA -233
BB -401
CC 213
DD -481
Express your answer in kilojoules.