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Chem 302 Cat Ii Question Paper

Chem 302 Cat Ii 

Course:Bachelor Of Science In Biochemistry

Institution: Egerton University question papers

Exam Year:2005



Chemistry Department.

CHEM 302 PHYSICAL CHEMISTRY

TIME: 1 HR

CAT II

Answer all questions.

1.(a) State the third law of thermodynamics.(2 marks)

(b) Predict the sign of?S0 for each of the following changes.

(i) AgCl(s)--------Ag+(aq)+CL- (aq)

(ii) 2H2(g)+ O2 (g)---------2H2O(l)

(iii) 2H2O(l)----------2H2O(g)

(c) Two moles of an ideal gas are expanded isothermally from 25 L to 125 L at 320 K.

Calculate q and ?S for the process.(5 ½ marks)

2.(a) The Haber process is:

N2(g) + 3H2(g)------------2NH3(g)

(i) Calculate ?H0,?S0 and ?G0 for the reaction

(8 ½ marks)

(ii) Account for the sign of (?H0-?G0) ( 2 marks)

(iii) Compute Kp for the Haber process at 298 K.(4 marks)

Useful data:

---------------N2(g)-H2(g)-NH3(g)

?fH0(kJmol-1);----0-----0------(-46)

S0(JK-1 mol-1)-192-131---193

(b) The normal boiling point of benzene is 80.10C,and the heat of vaporization is ?H0vap=30.8 kJ mol-1.What is the boiling point of benzene (in 0C) on top of Mt.Kenya,where P=260 mmHg.(Assume 1 atm=760 mm Hg).(5 marks)




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