Part A. Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D. Express your answer to three significant figures and include the appropriate units.
Use the following data:

Substance
ΔH∘f (kJ/mol)
Substance
ΔH∘f (kJ/mol)

A
-235
C
197

B
-381
D
-477

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.

Question

Part A. Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D. Express your answer to three significant figures and include the appropriate units.
Use the following data:



Substance
ΔH∘f (kJ/mol)
Substance
ΔH∘f (kJ/mol)


A
-235
C
197


B
-381
D
-477



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.

Substance	ÎHâf (kJ/mol)
A	-273
B	-385
C	195
D	-491

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Substance	ΔH∘f (kJ/mol)	Substance	ΔH∘f (kJ/mol)
A	-235	C	197
B	-381	D	-477