6_First_law_apps

6_First_law_apps - CHEM 300 Fall 2011 Applications of the...

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Unformatted text preview: CHEM 300 Fall 2011 Applications of the First Law of Thermodynamics Δ r H° (kJ mol-1 ): standard enthalpy of reaction at 1 bar and a temperature of 298 K n Heat of reaction: The heat change in the transformation of reactants at some T and p to produce products at the same T and p. n (q p = Δ r H at constant p, subscript r denotes reaction) n Exothermic reaction n Gives off heat to the surroundings n Endothermic reaction n Heat is absorbed from the surroundings Thermochemistry studies energy transfer as heat in chemical reactions n Solid to Liquid → fusion n ∆ fus H o n Liquid to gas → vaporization n ∆ vap H o n Solid to gas → sublimation n ∆ sub H o The enthalpy of phase transition Standard enthalpies of transition ( υ – stoichiometric coefFcient ) aA + bB ⾮ cC + dD Δ r H o = c Δ f H o C ( ) + d Δ f H o D ( ) − a Δ f H o A ( ) − b Δ f H o B ( ) Δ f H o = 0 for elements in their most stable allotropic form n The standard molar enthalpy of formation Δ f H° of a...
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This note was uploaded on 11/28/2011 for the course CHEM 300 taught by Professor N.gerber during the Fall '11 term at S.F. State.

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6_First_law_apps - CHEM 300 Fall 2011 Applications of the...

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