What is the heat of reaction if the heat of combustion of products is 40 J and h

Question

What is the heat of reaction if the heat of combustion of products is 40 J and heat of combustion of reactants is 25 J?

Options:

A . 5 J

B . 10 J

C . 15 J

D . -15 J

Answer: Option D
Answer: (d).-15 J

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