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1. What is meant by enthalpy?2. Derive an equation for enthalpy change. 3. What is enthalpy change? |
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Answer» 1. Enthalpy is the sum of internal energy and pressure volume energy. i.e. H = U + pV 2. ∆H = ∆U + ∆pV ∆H = ∆U + p∆V + V∆p At constant pressure, ∆p=0 ∆H = ∆U + p∆V But ∆U= q + w ∆H= q+ w+ p∆V w = -p∆V i.e; ∆H= q – p∆V + p∆V ∆H = qp 3. Enthalpy change is heat absorbed or released at constant pressure. |
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