HW%202%20Solutions - HW 2 Solutions CH 353: Physical...

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Unformatted text preview: HW 2 Solutions CH 353: Physical Chemistry I (54655) Spring 2008 Bersuker (8 points) I. A sample containing 35.0 g of Ar is enclosed in a container of volume 0.165 L at 390 K. Calculate P using the ideal gas and Van der Waals equations of state. Based on your results, does the attractive or repulsive contribution to the interaction potential dominate under these conditions? Because P vdW < P ideal gas , the attractive part of the interaction appears to dominate using the van der Waals equation of state. (7 points) II. From the data in table 2.5 in Atkins, calculate Δ r H and Δ r U at: (a) 298 K (b) 378 K for the reaction C(graphite) + H 2 O ( g ) → CO( g ) + H 2 ( g ). Assume all heat capacities to be constant over the temperature range of interest. (a) 1- 1- 1- 1 1 Reactants products mol kJ 81 . 128 mol kJ 48 . 2 mol kJ 29 . 131 ) 298 ( ) 298 ( mol kJ 29 . 131 mol kJ )] 82 . 241 ( ) 53 . 110 [( ) 298 ( = − = Δ − Δ = Δ = − − − = Δ Δ − Δ = Δ − − ∑ ∑ RT n K H K U K H H H H g r r r f f r ν ν (b) 1...
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This note was uploaded on 04/16/2008 for the course CH 353 taught by Professor Bersuker during the Spring '08 term at University of Texas at Austin.

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HW%202%20Solutions - HW 2 Solutions CH 353: Physical...

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