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Sch 101: Introduction To Physical Chemistry Question Paper

Sch 101: Introduction To Physical Chemistry

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2007

Answer all questions
1. Calculate the mass of
a) Nitrogen enclosed in a 1 liter flask at 250C that exerts a pressure of 5 atm
b) Argon enclosed in a 0.1M3 flask at 250C that exerts a pressure of 25000 NM-2
2. State Dalton’s law of partial pressure
b)0.50g Neon gas and 0.50g Argon gas are placed in a 3 litre flask at 270C . what is the partial pressure of each gas and the total pressure of the mixture of gasses in atm
FOR QUESTIONS 3-7
The ionization constant of acetic acid K=[CH 3COO -][H+]/ [CH3COOH] , is approximately 10-5 mol dm-1 at 250C , and the ionization constant for ammonia , Kb =[NH4+][OH-] / [NH3] Is also approximately 10-5Mol dm-3 at 250C
Consider the following mixtures and answer question 3-7
A : a solution of 1 M acetic acid
B: a solution of 1M ammonia
C : a mixture of equal volumes of 1M sodium acetate and 1M acetic acid
D: a mixture of equal volumes of 1M ammonia and 1M ammonium chloride
E: a mixture of equal volumes of 1M ammonia and 1M acetic acid
3. Which solution will give a PH of approximately 5
4. Which solution will give a PH of approximately 9
5. Which solution will be the mostly acidic?
6. Which solution will give a PH nearest to 11.5?
7. Which solution will be an alkaline buffer solution?
8. The equilibrium constant Kc for the reaction 2SO3 (g) <-> 2SO2 + O2 (g) is 0.0271M at 1100K,calculate Kp at the temperature
b)what would be the effect of pressure on Kp for this reaction?
FOR QUESTION 9 AND 10
Benzene and Toluene form nearly ideal solutions. If at 300K, Po(toluene) =3.572 KPa and P0(benzene)=9.657KPa.
9. Compute the vapour pressure of a solution containing 0.60 mole fraction toluene
10. What is the mole fraction of toluene in the vapour over this solution
FOR QUESTION 11 AND 12
The zinc-silver oxide cell used in watches is based on the following half reactions
Zn2+ (ag)+2e- ->Zn (s) E0 = -0.76V
Ag 2 O(s) +H2O + 2e ->2Ag(s)+ 2OH - E0=0.344V
11. Which substance is oxidized and which is reduced in the cell during discharge
b)which is cathode and which is the anode
12. Which EMF does this cell generate at standard conditions
b)write the standard cell reaction
13. Given the cell Zn|Zn2+||Fe3+,Fe2+| (pt)
a) Write down the net cell reaction
b) Given that E0(Fe3+,Fe2+ (pt))=0.711V andE0 (Zn|Zn2+)=0.763 V at 250C
c) Calculate the equilibrium constant for the cell at 250C
d) Predict, with reason, whether the cell reaction is spontaneous

Sch 101: Introduction To Physical Chemistry Question Paper

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