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Physical Chemistry Iii Question Paper

Physical Chemistry Iii 

Course:Bachelor Of Science In Biochemistry

Institution: Egerton University question papers

Exam Year:



CHEMISTRY DEPARTMENT

CAT 1 CHEM 302-PHYSICAL CHEMISTRY 111

INSTRUCTIONS:Answer ALL questions TIME:1HR

DATA: R=8.314 Jmol-1 K-1=0.082066L atm mol-1 K-1

At.Mass:o=16.0

1.a) Define the following terms:

i) System

ii) Reversible process

iii) Adiabatic process.(3 marks)

b) From the first law of thermodynamics,show that for a reversible adiabatic expansion of an ideal gas:PVy=constant.(4 marks)

c) One mole of N2 gas expands reversibly and adiabatically from 200cm3 to 300cm3 against a pressure of 1 atmosphere.What will be final pressue,if Cp/Cv=1.7(4 marks)

d) If the same gas in (c) expanded reversibly and isothermally,what would be the final pressure at 250C?.(4 marks)

2. 56g of oxygen gas (an ideal gas) are expanded isothermally and irreversibly from 20 litres to 30 litres against a constant external pressure.The total work done for the process is found to be -5,065.8J

a) Determine the external pressure present during the expansion.(3 marks)

b) Compute ?U,?H and q for the process.(7 marks)

c) If the system is at equilibrium at the end of the expansion,what is the temperature of the system?(5 marks)




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