Consider the following reactions:
(i) \( \mathrm{H}^{+}+(\mathrm{aq...
Consider the following reactions:
(i) \( \mathrm{H}^{+}+(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq})=\mathrm{H}_{2} \mathrm{O}_{(I)} \), \( \Delta \mathbf{H}=-X_{1} \mathbf{k J} \mathbf{m o l}^{-1} \)
(ii) \( \mathbf{H}_{2(\mathrm{~g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})}=\mathrm{H}_{2} \mathrm{O}(l) \),
\( \Delta \mathrm{H}=-\mathrm{X}_{2} \mathbf{k J} \mathrm{mol}^{-1} \)
(iii) \( \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2}(\mathrm{~g})=\mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O} \),
(iv) \( \mathrm{C}_{2} \mathrm{H}_{2(\mathrm{~g})}+\frac{5}{2} \mathrm{O}_{2(\mathrm{~g})}=2 \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(l)^{\prime} \) \( \Delta \mathrm{H}=+4 \mathrm{X}_{4} \mathrm{k} \mathbf{J} \mathrm{mol}^{-1} \)
- Enthalpy of formation of \( \mathrm{H}_{2} \mathrm{O} \) (1) is
(a) \( +X_{3} \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(b) \( -x_{4} \mathrm{~kJ} \mathrm{~mol} \mathrm{~mol}^{-1} \)
(c) \( +X_{1} \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(d) \( -X_{2} \mathrm{~kJ} \mathrm{~mol}^{-1} \)
\( \mathrm{P} \)
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