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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:2006
SECTION A
ANSWER ALL QUESTIONS IN THIS SECTION
1. The equilibrium for the reaction
A + B <-> C + D
Is at 25 0C.starting with 2 moles of A and 1 mole of B, how many moles of C will the equilibrium mixture contain?
2. Nitrogen gas is introduced into a 10 L flask at 298 K at a pressure of 0.62 atm
I. Calculate the number of moles of the gas
II. 0.25 mol O2 ¬ and 0.1 mol CO2 are then added into the flask, what is the partial pressure of each gas and the total pressure?
3. a) what effect will the following change have on the volume of a fixed amount of gas? An increase in pressure at constant temperature
b) a gas –phase reaction is run in which 1.25L of gas phase reactants converts to 3.75L of gas phase products . at the start of the reaction , 0.113 mol of reactant is present . how many moles of products are formed? The temperature and pressure of the reaction system is the same at the end of the reaction as at the start
4. given the following equilibrium at 298 K
2NO2CL(g) <-> 2 NO2{g) + CL2(g)
If at equilibrium the concentrations are NO¬2CL = 0.00106M, NO¬2=0.0108M and CL2=0.00538M
a) Determine Kc and
b) Kp
5.calculate PH of 1M solution of
a) HCL
b) KOH
c) H2SO4 and
d) HCOOH(Ka= 1.8 * -4)
6. given the K sp = 2.0 *10-47 M3 , what is the solubility of Cu2S?
7. a). Benzene and Toluene form nearly ideal solution. If at 300K p0 (toluene)= 3.572Kpa, P0(benzene)= 9.657 K pa. compute the vapour pressure of a solution containing 0.60 mol fraction of toluene
b) what is the mole fraction of toluene in the vapour over this solution
8. a cell is constructed as follows (t=250C )
Pb(s)|Pb(NO3)2=1m||AgNO3=1M|Ag(s)
a) What is the cell reaction under standard conditions?
b) Calculate E0 at 250C
9. a) what should be the ratio of sodium acetate concentration to acetic acid concentration to produce a buffer of PH = 5.00 (Ka= 1.75*10-5)
b) if the acid concentration is 0.100M, what should the sodium acetate concentration be?
10. a) compute a cell for which the cell reaction is
Zn(g)+ Cu2+(aq)= Cu(g) + Zn 2+
b)if E0{Cu2+|Cu)= 0.337V and E0(Zn2+/Zn) = - 0.763V), calculate the equilibrium constant at 25 0C (R=8.314JK-1Mol-1, F= 96500 coulombs)
11. when equal amounts of 0. 150M NaOH and HCL are mixed the PH is 7, however when HCL is replaced with HOCL the solution is basic. Explain
b) calculate the PH at the following points for the titration of 25.00ml of 0.100M HOCL with 0.150 NaOH
i. Before addition of any base
ii. After addition of 10.00 ml of base
iii. At the equivalence point ( 16.33 ml of base total )
iv. After addition of 5.00 ml of base beyond the equivalence point
Ka(HOCL) = 3.0*10-8, pKa =7.53
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