What is the heat of reaction if the heat of combustion of products is 2 J and he

Question

What is the heat of reaction if the heat of combustion of products is 2 J and heat of combustion of reactants is 10 J?

Options:

A . 8 J

B . -8 J

C . 4 J

D . -4 J

Answer: Option A
Answer: (a).8 J

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