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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:2005

ANSWER ALLL QUESTIONS

1(a)
(i)the ph of household bleach is approximately 12 at 250C . what is the hydrogen concentration of the bleach.
(ii)In a sample of lemon juice , [H+], is 3.8 * 10-4M .what is the PH?
(b)if the dissociation constant of ethanoic acid in aqueous solution is 1.8 * 10-5 at 250C, calculate approximate pH at the same temperature of
i) 2M ethanoic acid
ii)a mixture of 100 cm3 of 0.2 M ethanoic acid and 100cm3 of 0.5 M sodium ethanoate solution .
2. two litres of a certain gas at 1 atm pressure and at 2730C weighs 1.34grams
a. What will be the volume of the gas at 2 atm pressure at a temperature of -350C?
b. The temperature is increased to 4000C.what will be the final pressure if the volume remains the same
c. How many molecules are present on 10ml of this gas when the pressure is 0.1 atm and the temperature is 500C
d. What is the molecular mass of the gas
3.the equilibrium constant is 4.00 for the reaction
CH¬¬¬3COOH + C2 H¬¬¬5OH <-> CH3 COOC2H5 + H2O
At 1000C . calculate the number of moles of each substance present at the equilibrium if the starting number of moles is..
Acid alcohol ester water
i)4 4 0 0
ii)2-n 1-n -1+n 2+n
4 a) write down the cathode, anode and the net cell reaction of the following cells at 250C. Calculate the cell EMF’s
i) Cu|cu2+ || Cl- |Cl(g)|pt)
Given that E0 (Cl-|Cl(g)|pt)=1.360V
E0 (Cu2+|Cu) = -0.337V
ii) pt|Sn2+ |Sn4+ ||Fe3+ |Fe2+|pt
given that E0 (Sn4+|Sn2+ )=0.15V
E0 (Fe3+|Fe2+ |pt)=0.771V

b)compute a cell for which the cell reaction is
i) Zn(s)+ Cu2+ => Cu(s) + Zn2+|
ii) if E0(Cu2+|Cu)=0.337V and E0(Zn2+|Zn)= -0.763V,calculate the equilibrium constant for this reaction.
(R=8.314JK-mol-1;F=96500 coulombs)
5. a) mixtures of water and ethanol obey Roult’s vapour pressure law .state Roult’s law
b) at 63.50C the vapour pressure oh H20 is 175mmHg and that of ethanol C2H5OH is 400 mmHg . a solution is made by mixing equal masses of H20 and C2H5OH
i)what is the mole fraction of ethanol in this solution
ii) assuming ideal solution behavior, what is the vapour pressure of the solution at 63.50C?
(N=14,O=16,H=1)

Sch 101: Introduction To Physical Chemistry Question Paper

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