Problem: Part A Calculate the standard enthalpy change for the reaction 2A + B ⇌ 2C + 2D Use the following data:Substance ΔHf° (kJ/mol)A -235B -381C 197D -477Express your answer to three significant figures and include the appropriate units. Part B For the reaction given in Part A, how much heat is absorbed when 3.70 mol of A reacts? Express your answer to three significant figures and include the appropriate units.

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Problem Details

Part A Calculate the standard enthalpy change for the reaction 2A + B ⇌ 2C + 2D Use the following data:

Substance ΔHf° (kJ/mol)

A -235

B -381

C 197

D -477

Express your answer to three significant figures and include the appropriate units.

Part B For the reaction given in Part A, how much heat is absorbed when 3.70 mol of A reacts? Express your answer to three significant figures and include the appropriate units.

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