Study the following thermochemical data:<br><br><br><br><br>The enthalpy of formation of at 298 K wi — Thermodynamics and Thermochemistry Chemistry Question
Question
Study the following thermochemical data:<br>$\text{S} + \text{O}_2 \to \text{SO}_2; \Delta H = -298.2\text{ kJ}$<br>$\text{SO}_2 + 1/2 \text{O}_2 \to \text{SO}_3; \Delta H = -98.2\text{ kJ}$<br>$\text{SO}_3 + \text{H}_2\text{O} \to \text{H}_2\text{SO}_4; \Delta H = -130.2\text{ kJ}$<br>$\text{H}_2 + 1/2 \text{O}_2 \to \text{H}_2\text{O}; \Delta H = -287.3\text{ kJ}$<br>The enthalpy of formation of $\text{H}_2\text{SO}_4$ at 298 K will be
Answer: D
💡 Solution & Explanation
Enthalpy of formation maps to the direct combination from elements: $\text{H}_2 + \text{S} + 2\text{O}_2 \to \text{H}_2\text{SO}_4$. This can be achieved by simply adding all four given equations: $-298.2 - 98.2 - 130.2 - 287.3 = -813.9\text{ kJ}$.
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