Question

Consider the following reactions:
(i) $H^+(aq) + OH^-(aq) \longrightarrow H_2O(l)$, $\Delta H$ = – X₁ kJ mol⁻¹
(ii) $H_2(g) + \frac{1}{2} O_2(g) \longrightarrow H_2O(l)$, $\Delta H$ = – X₂ kJ mol⁻¹
(iii) $CO_2(g) + H_2(g) \longrightarrow CO(g) + H_2O$, $\Delta H$ = – X₃ kJ mol⁻¹
(iv) $C_2H_2(g) + \frac{5}{2} O_2(g) \longrightarrow 2CO_2(g) + H_2O(l)$, $\Delta H$ = +4X₄ kJ mol⁻¹
Enthalpy of formation of H₂O (l) is
(a) + X₃ kJ mol⁻¹
(b) – X₄ kJ mol⁻¹
(c) + X₁ kJ mol⁻¹
(d) – X₂ kJ mol⁻¹

Answer 1

Answer:

(c) + X₁ kJ mol⁻¹

Is your Correct Option.

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