In the enthalpy relation, Δ H = (q)p + Δ (PV), the value Δ (PV) can be neglected for the reactions involving?
Correct answer: C. Liquids and solids
- A. Gases
- B. Liquids
- C. Liquids and solids
- D. Liquids and Gases
Explanation
In the case of solids and liquids, the changes in the state do not cause significant volume change, i.e ΔV = 0. According to the first law of thermodynamics,ΔE = q + ww = -PΔVΔE = q - PΔVΔH = qp -PΔV +PΔVΔH = qp
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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