Thermodynamics and Thermochemistry 2 Question 12
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12. The $\Delta H_{f}^{\circ}$ for $\mathrm{CO}{2}(g), \mathrm{CO}(g)$ and $\mathrm{H}{2} \mathrm{O}(g)$ are $-393.5,-110.5$ and $-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The standard enthalpy change (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the reaction $\mathrm{CO}{2}(g)+\mathrm{H}{2}(g) \longrightarrow \mathrm{CO}(g)+\mathrm{H}_{2} \mathrm{O}(g)$ is
======= ####12. The $\Delta H_{f}^{\circ}$ for $\mathrm{CO}{2}(g), \mathrm{CO}(g)$ and $\mathrm{H}{2} \mathrm{O}(g)$ are $-393.5,-110.5$ and $-241.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The standard enthalpy change (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) for the reaction $\mathrm{CO}{2}(g)+\mathrm{H}{2}(g) \longrightarrow \mathrm{CO}(g)+\mathrm{H}_{2} \mathrm{O}(g)$ is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) 524.1
(b) +41.2
(c) -262.5
(d) -41.2
(2000, 1M)
Objective Question II
(One or more than one correct option)
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Solution:
- $\mathrm{CO}{2}(g)+\mathrm{H}{2}(g) \longrightarrow \mathrm{CO}(g)+\mathrm{H}_{2} \mathrm{O}(g)$
$$ \Delta H=\Sigma \Delta_{f} H^{\circ}(\text { products })-\Sigma \Delta_{f} H^{\circ} \text { (reactants) } $$
$$ =-110.5-241.8-(-393.5)=+41.20 \mathrm{~kJ} $$
