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Question 45 Review
Which balanced equation represents an endothermic reaction?
C(s) + 0₂ (8)→CO2₂ (8)
2 CH4 (8) +20₂ (8) 0₂ (8) + 2H₂O(4)
N₂ (8)+ 3H₂ (8)→ 2NH3 (8)
4. N₂ (8)+0₂ (8) 2NO(g)
1
3₂
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Answer 1

The balanced equation that represents an endothermic reaction is:

2 CH4 (g) + 2 O2 (g) → 2 CO2 (g) + 2 H2O (g)

This is because the reactants (CH4 and O2) have a higher bond energy than the products (CO2 and H2O), meaning that energy must be absorbed in order to break the bonds and form the products. As a result, the reaction is endothermic.