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Introduction To Physical Chemistry Question Paper

Introduction To Physical Chemistry

Course:Bachelor Of Education

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2008/2009
INSTITUTE OF OPEN LEARNING
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE AND
BACHELOR OF EDUCATION
SCH 101: INTRODUCTION TO PHYSICAL CHEMISTRY
DATE: THURSDAY, 13TH AUGUST 2009

TIME: 11.00 A.M. - 1.00 P.M.

INSTRUCTIONS: Answer ALL questions.

1.
(a)
State four assumptions on which the kinetic theory of ideal gases is based. (4 marks)
(b)
(i)
State Dalton’s Law of partial pressures. (2 marks)
(ii)
Seven grams of Nitrogen gas and sixteen grams of Oxygen gas are introduced into an evacuated vessel of 50 litres capacity at 50oC. Determine the total pressure of the mixture assuming ideal behaviour (N = 14, O = 16). (4 marks)
2.
Chlorine is widely used to purify Municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of chlorine (Cl2) is 6.18 L at 740 mmHg and 33oC.
(a)
What volume will the Cl2 occupy at 107oC and 680 mmHg? (3 marks)
(b)
What volume will the Cl2 occupy at STp? (3 marks)
(c)
At what temperature will the volume be 3.00 L is the pressure is 8.00 x 102 mmHg? (3 marks)
(d)
How many moles of chlorine are present in the containers. (3 marks)
3.
Hydrogen and Iodine react to form Hydrogen Iodide.
(a)
Write the equation for the formation of hydrogen iodide from hydrogen and iodine (3 marks)
(b)
Write an expression for the equilibrium constant Kc. (3 marks)
4.
(a)
For the gaseous reaction aA + bB cC+dD, derive the relationship between Kp and Kc. (5 marks)
(b)
For the reversible reaction. N2 + 3H2 2NH3 at 500oC, the value of Kp with partial pressures in atmospheres is 1.44 x 10-5 at low pressures, where the gases behave ideally. Calculate the corresponding value of Kc with corresponding moles per a litre. (5 marks)
5.
(a)
0.447 g of a common chlorofluorocarbon in a 100 ml flask exert a pressure of 758 mmHg at 100oC. What is its molar mass? (5 marks)
(b)
12.0 L of an ideal gas at 60.0oC and 2.25 atm are expanded to 16.0 L and increased in temperature to 120oC. What is the new pressure of the gas? (5 marks)
6.
(a)
Describe the primary factors that cause a gas not to conform to the ideal gas equation. (5 marks)
(b)
Calculate the pressure exerted by 1.00 moles of CO2(g) when it is confined to a volume of 2.50 litres at 298 K by
(i)
using the Van der Waals equation. (4 marks)
(ii)
using the ideal gas equation. (4 marks)
7.
For the cell Mn/Mn2+ (0.5M) // Pb2+ (1.5M) Pb and given that the standard reduction potentials for the half-cell Mn/Mn2+ and Pb/Pb2+ are -1.180V and -0.126V respectively.
(a)
Write down the cell reaction. (2 marks)
(b)
Calculate the emf at 25oC. (4 marks)
(c)
Determine the cell equilibrium constant at 25oC (4 marks)

Introduction To Physical Chemistry Question Paper

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