1.

What is the heat of reaction for C₂H₄ + 3O₂ -> 2CO₂ + 2H₂O, if heat of formation of C₂H₄, O₂, CO₂, and H₂O are 10 J, 5 J, 6 J and 2 J respectively?

A. -4 J
B. -2 J
C. 0
D. 4 J
Answer» B. -2 J


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