Thermodynamics and ThermochemistrymediumMCQ SINGLE

The for , and are –393.5, –110.5 and –241.8 kJ mol, respectively. The standard enthalpy change (in kThermodynamics and Thermochemistry Chemistry Question

Question

The $\Delta_f H^\circ$ for $\text{CO}_2\text{(g)}$, $\text{CO(g)}$ and $\text{H}_2\text{O(g)}$ are –393.5, –110.5 and –241.8 kJ mol$^{-1}$, respectively. The standard enthalpy change (in kJ) for the reaction:<br>$\text{CO}_2\text{(g)} + \text{H}_2\text{(g)} \to \text{CO(g)} + \text{H}_2\text{O(g)}$ is

Answer: B

💡 Solution & Explanation

$\Delta H_{rxn} = [\Delta H_f(\text{CO}) + \Delta H_f(\text{H}_2\text{O})] - [\Delta H_f(\text{CO}_2) + \Delta H_f(\text{H}_2)] = [-110.5 + (-241.8)] - [-393.5 + 0] = -352.3 + 393.5 = +41.2\text{ kJ}$.

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