Chemistry · The first law of thermodynamics: Concept of work, heat, internal energy and enthalpy, heat capacity, molar heat capacity
\longrightarrow \boldsymbol{C a O}(\boldsymbol{s})+\boldsymbol{C O}_{2}(\boldsym
\( \boldsymbol{C a} \boldsymbol{C O}_{3}(\boldsymbol{s}) \longrightarrow \boldsymbol{C a O}(\boldsymbol{s})+\boldsymbol{C O}_{2}(\boldsymbol{g}) \) For this reaction relate \( \Delta H \) and \( \Delta U \)
- A. \( \Delta H=\Delta U \)
- B. \( \Delta H>\Delta U \)
- C. \( \Delta H<\Delta U \)
- D. None of these
Step-by-step solution
For the reaction CaCO3(s) → CaO(s) + CO2(g), the change in moles of gas (Δn_g) is +1 (1 mol gas product, 0 mol gas reactant). Using the relation ΔH = ΔU + Δn_g RT, we get ΔH = ΔU + RT. Since RT > 0, ΔH > ΔU.
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