What is the heat of reaction if the heat of combustion of products is 10 J and h

Question

What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 15 J?

Options:

A . -5 J

B . 5 J

C . 10 J

D . Cannot say

Answer: Option B
Answer: (b).5 J

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