Chemistry - Thermochemistry Question with Solution | TestHub

A: S(g) + O₂(g) $\Rightarrow$ SO₂(g)

Formation of a compound from elements $\Rightarrow$ Heat of formation (r).

B: CH₄ + 2O₂ $\Rightarrow$ CO₂ + 2H₂O

Burning in oxygen $\Rightarrow$ Heat of combustion (s).

C: NaOH(s) $\Rightarrow$ NaOH(aq)

Dissolving in water $\Rightarrow$ Heat of solution (p).

D: NaOH + HCl $\Rightarrow$ NaCl + H₂O

Acid + base reaction $\Rightarrow$ Heat of neutralization (q).

Hence, A $\to$ r, B $\to$ s, C $\to$ p, D $\to$ q.