Lecture13 - Enthalpy and Entr opy Reading 17.1 to 17.5 HW...

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Unformatted text preview: Enthalpy and Entr opy Reading: 17.1 to 17.5 HW: P808 # 23, 29, 37, 39, 41, 43 Pr oduct vs. Reactant Favor ed • Pr oduct Favor ed, Spontaneous, Lar ge K *H Cl + H 2 O → Cl- + H 3 O + *(NH 4 ) 2 CO 3 (s) → 2 NH 4 + (aq) + CO 3 2- (aq) *H 2 O(s) → H 2 O(l) at 25°C • Reactant Favor ed, Non-spontaneous, Small K *H 3 PO 4 + H 2 O → H 2 PO 4- + H 3 O + *CaCO 3 (s) → Ca 2+ (aq) + CO 3 2- (aq) *H 2 O(l) → H 2 O(s) at 25°C Ther modynamics • Why do r eactions occur ? • What factor s deter mine if r eactions ar e pr oduct favor ed (spontaneous) or r eactant favor ed (nonspontaneous)? • Standar d Ther modynamic Conditions *1 atm and 25°C Enthalpy (H eat Content) H = pr oduct PE – r eactant PE ∆ • 1 st Law Ther mo: Conser vation of Ener gy • Ener gy Flow *System to Sur r oundings, Exother mic, H - ∆ *Favor ed by natur e , cr eates lower ener gy systems *Sur r oundings to System, Endother mic, H + ∆ ∆ H , Path I ndependent • A + B → AB H = - 40 kJ ∆ • AB...
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Lecture13 - Enthalpy and Entr opy Reading 17.1 to 17.5 HW...

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