Use the following data: Substance H f (kJ/mol) A -257 B -379 C 225 D -475 Express your answer to three significant figures and include the…

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

ΔH∘rxn = 393 kJ

product – reactants energy = enthalpy

enthalpy change is = (2*C +2*D) – (2*A + B)

hence answer is 393 kJ

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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