PS4_11 - Chem 444 Spring 2011 Homework Set#4 1 A chemical reaction takes place in a container of cross-sectional area 100 cm2 As a result of the

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Problem Set #4 - 1 - Chem 444 – Spring 2011 Homework Set #4 1) A chemical reaction takes place in a container of cross-sectional area 100 cm 2 . As a result of the reaction, a piston is pushed out through 10 cm against an external pressure of 1.0 atm. Calculate the work (in J) done. Was this work done on the system or by the system ? 2) a) A sample of 4.50 g of methane occupies 12.7 L at 310K. Calculate the work (in J) done when the gas expands isothermally against a constant external pressure of 7.7 kPa until its volume has increased by 3.3 L. b) Calculate the work done if the same expansion had occurred reversibly. 3) a) Repeat problem 2b for a van der Waals gas using the expression derived in Lecture 10 b) Derive an expression for the work done during a reversible isothermal expansion of a Redlich-Kwong gas Note: 1l n l n ( ) () x xa dx xx a a a + =− + c) Repeat problem 2b for a Redlich-Kwong gas 4) a) What would be the final volume (in L) occupied by 1.00 mol of an ideal gas initially at 0 °C and 1.00 bar if q = 1,000 J during a reversible isothermal expansion? b) Repeat the problem assuming an isothermal expansion against a constant pressure of 1.00 bar 5) McQ&S, 19-7
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This note was uploaded on 04/01/2012 for the course CHEM 444 taught by Professor Gruebele,m during the Spring '08 term at University of Illinois, Urbana Champaign.

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PS4_11 - Chem 444 Spring 2011 Homework Set#4 1 A chemical reaction takes place in a container of cross-sectional area 100 cm2 As a result of the

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