Consider the following reactions : (i) H+(aq) + OH$-$(aq) = H2O(l), $\Delta $H = $-$ X1 kJ mol$-$1 (ii) H2(g) + 1/2O2(g) = H2O(l), $\Delta $H = $-$ X2 kJ mol$-$1 (iii) CO2(g) + H2(g) = CO(g) + H2O(l), $\Delta $H = $-$ X3 kJ mol$-$1 (iv) C2H2(g) + 5/2O2(g) = 2CO2(g) + H2O(l), $\Delta $H = +X4 kJ mol$-$1 Enthalpy of formation of H2O(l) is

Question

Consider the following reactions :
(i) H⁺_(aq) + OH^$-$_(aq) = H₂O_(l),  $\Delta $H = $-$ X₁ kJ mol^$-$1
(ii) H_2(g) + 1/2O_2(g) = H₂O_(l),   $\Delta $H = $-$ X₂ kJ mol^$-$1
(iii) CO_2(g) + H_2(g) = CO_(g) + H₂O_(l),  $\Delta $H = $-$ X₃ kJ mol^$-$1
(iv) C₂H_2(g) + 5/2O_2(g) = 2CO_2(g) + H₂O_(l),    $\Delta $H = +X₄ kJ mol^$-$1

Enthalpy of formation of H₂O_(l) is

+X₃ kJ mol^$-$1

$-$X₄ kJ mol^$-$1

+X₁ kJ mol^$-$1

$-$X₂ kJ mol^$-$1

Solution

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