Ch03-thermochem

Ch03-thermochem - CHM 341 Elementary Physical Chemistry...

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Ch 3: Thermochemistry CHM 341 Elementary Physical Chemistry Fall 2009 Ranko Richert
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H m for heating N 2 from 25°C ( T 1 ) to100°C ( T 2 ): (at constant pressure) () 1 1 1 1 2 1 1 2 2 2 2 1 1 373 T 298 T 2 1 1 2 1 1 2 , , , 1 , 2 mol kJ 20 . 2 mol J K 2 2 mol J K 2 mol J K mol J K 2 1 2 1 2 1 = = = + + = + = + + = + + = = = m m m T T m m p T T m p m m m H T c T b aT T c T b aT H T c T b aT H dT T c bT a H T c bT a T C dT T C H H H 1 1 1 , 1 2 , , mol kJ 19 . 2 K 75 mol J K 14 . 29 C 25 constant assuming estimate = = = ° = = m m p m p m p m p H T C T T C T C H C
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Calculating the molar enthalpy of vaporization: Water is kept boiling at p = 1 atm using electric heater with V = 12 V and I = 0.50 A for t = 300 s. It is found that 0.798 g of water is vaporized. Calculate vap U m and vap H m at boiling point T = 373.15 K (temperature and pressure are constant).
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This note was uploaded on 10/10/2009 for the course CHM 341 taught by Professor Richert during the Spring '08 term at ASU.

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Ch03-thermochem - CHM 341 Elementary Physical Chemistry...

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