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Calculate the standard enthalpy change for the reaction 2A+B2C+2D where the heats of formation are given in the following table: Substance Hf ( kJ/mol )

Calculate the standard enthalpy change for the reaction 2A+B2C+2D where the heats of formation are given in the following table: Substance Hf ( kJ/mol ) A -243 B -405 C 205 D -517 Express your answer in kilojoules.

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