This thermochemical equation needs to be balanced. Hence, option B is correct.
<h3>What is a balanced chemical equation?</h3>
A balanced equation contains the same number of each type of atom on both the left and right sides of the reaction arrow.
The balanced thermochemical equation is:
→ 
Hence, option B is correct.
Learn more about the balanced chemical equation here:
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Energy is absorbed so, the mass is increased.
energy is released so, the mass is increased
I think xe possess expanded octet