The for , and are β393.5, β110.5 and β241.8 kJ mol, respectively. The standard enthalpy change (in k β Thermodynamics 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 β393.5, β110.5 and β241.8 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
π‘ Solution & Explanation
$\Delta H_{rxn} = [\Delta H_f(\text{CO}) + \Delta H_f(\text{H}_2\text{O})] - [\Delta H_f(\text{CO}_2) + \Delta H_f(\text{H}_2)] = [-110.5 + (-241.8)] - [-393.5 + 0] = -352.3 + 393.5 = +41.2\text{ kJ}$.
π¬Ask on WhatsApp β
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp β gets answered in minutes