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Chapter_6b-B

# Chapter_6b-B - Chapter 6b(6.4& 6.6 Energy Enthalpy and...

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Unformatted text preview: Chapter 6b (6.4 & 6.6) Energy, Enthalpy and Hess’s Law ∆ E and ∆ H v p q E p ∆- = ∆ w q E + = ∆ v p q E v ∆- = ∆ If the only kind of work is expansion: V p q E ∆- = ∆ V p ≈ ∆- H E ∆ ≈ ∆ q E v = ∆ v p E q p ∆ + ∆ = q p = ∆ H Enthalpy (H) Heat content of a body of matter H = E + pV (definition) ∆ H = H final – H initial = ∆ E + ∆ (pV) ∆ H = q p ∆ H = Characteristics of ∆ H When ∆ H is negative ( ∆ H<0): The process is When ∆ H is positive ( ∆ H>0): The process is • ∆ H is a • When a process is reversed, ∆ H will have the same magnitude but • ∆ H is • ∆ H is Changes of State Changes of State Involve: • Particles moving more rapidly and farther apart • E required to overcome attractive force → fusion of heat → on vaporizati of heat ∆ ∆ H H fusion fusion = heat energy required to melt a solid ∆ H of a Phase Change: Water at 25 °C H 2 O Gas Liquid H 2 O ∆ H = ∆ H vap = ∆ H for Chemical Reactions A + B → C reactants: initial state products: final state init final H H H- = ∆ ⇒ kJ 241.8- H O H O H 2 2 2 1 2 = ∆ → + (g) (g) (g) kJ...
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Chapter_6b-B - Chapter 6b(6.4& 6.6 Energy Enthalpy and...

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