MCQ
Which of the following always has a negative value?
- AHeat of reaction
- BHeat of solution
- CHeat of formation
- ✓Heat of combustion
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($R = 0.082\, L\, atm\, mol^{-1}\, K^{-1}$, Molar mass of $S = 32\, g\, mol^{-1}$, molar mass of $N = 14\, g\, mol^{-1}$)