1.

Heat of formations of A, B, C, and D, are 5 J, 10 J, 15 J, and 20 J respectively, what is the heat of reaction A + 4B -> 3C + D?(a) 10 J(b) 20 J(c) 35 J(d) 45 J

Answer» The correct choice is (b) 20 J

To explain: Heat of reaction = 20 + 3*15 – 4*10 – 5 = 20 J.


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