The Δf Ho for CO2(g), CO(g) and H2O(g) are −393.5, −110.5 and −241.8 kJ mol–1, respectively. The sta

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The Δf Ho for CO2(g), CO(g) and H2O(g) are −393.5, −110.5 and −241.8 kJ mol–1, respectively. The standard enthalpy change (in kJ) for the reactionCO2(g) + H2(g) → CO(g) + H2O(g) is

Accepted Answer

$\Delta_{r}H^{o} = \sum_{}^{}{\Delta_{f}H_{\text{Products}}^{o} -}\sum_{}^{}{\Delta_{f}H_{\text{Reactants}}^{o}}$

$= \left\lbrack \Delta_{f}H_{CO(g)}^{o} + \Delta_{f}H_{H_{2}O(g)}^{o} \right\rbrack - \left\lbrack \Delta_{f}H_{CO_{2}(g)}^{o} + \Delta_{f}H_{H_{2}(g)}^{o} \right\rbrack $$$= \left\lbrack ( - 110.5) + ( - 241.8) \right\rbrack - \left\lbrack ( - 393.5) + 0 \right\rbrack = 41.2\text{ kJ}$$

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