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set 5 soln

# set 5 soln - Chem 3433 Problem Set 5 Due before class on 1...

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Chem 3433 – Problem Set 5 Due before class on 10/5/11 1 A one-mole sample of a monatomic perfect gas with a constant pressure heat capacity of 20.85 J/(K mol) is initially at a pressure of 3.25 bar at 200 K. It undergoes an adiabatic reversible expansion until its pressure is 1.52 bar. Calculate: q, w, U, H and S. 0 q 0 S Find T 1 1 f i i i f V V T T T 1 1 1 1 / / i f f i f f i i f i i f P P T T P T P T V V T T 1 i f i f P P T T / 1 1 / 1 i f i i f i f P P T P P T T p p v p C nR C C C p p p C nR C nR C 1 1 3988 . 0 85 . 20 ) 3145 . 8 )( 1 ( 1 1 p C nR K K T f 147 25 . 3 52 . 1 ) 200 ( 3988 . 0 K T T T i f 3 . 52 J J T C H p 100 , 1 ) 3 . 52 )( 85 . 20 )( 1 ( K J nR C C p v 53 . 12 J J T C U v 655 ) 3 . 52 )( 53 . 12 )( 1 (

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2. A 4 L volume of a perfect gas at 300.0 K and 1.00 bar pressure undergoes a reversible isothermal compression until the pressure becomes 4.00 bar. Calculate: q, w, U, H and S. 0 U 0 H f i i f p P nRT V V nRT q ln ln mol mol K bar Pa x bar L m L RT PV n 160 . 0 ) 300 )( 3145 . 8 ( 1 10 1 ) 1 ( 1 001 . 0 ) 4 ( 5 3 J J p P nRT q f i 553 4 1 ln ) 300 )( 3145 . 8 )( 160 . 0 ( ln J q w 553 K J K J T q S 84 . 1 300 553 Cp,m for CHCl 3 is (91.47 + 7.5x10 -2 T) J/(K mol) in a limited temperature range. One mol of this compound at 325 K is cooled at constant P to 275 K by contact with a large reserve at 275 K. The temperature of the reserve does not change.
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set 5 soln - Chem 3433 Problem Set 5 Due before class on 1...

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