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Sch2108:Organic Chemistry Question Paper
Sch2108:Organic Chemistry
Course:Bachelor Of Science In Public Health
Institution: Meru University Of Science And Technology question papers
Exam Year:2014
DATE: APRIL 2012 TIME: 2 HOURS
INSTRUCTIONS: Answer question one and any other two questions
QUESTION ONE (30 MARKS)
a) State and briefly explain the four characteristics of gases that make them differ with
solids and liquids. (8 Marks)
b) Show a plot of the volume of a sample of gas as a function of temperature at three
different pressures. (5 Marks)
c) Explain the following terms
i. State function (2 Marks)
ii. Diathermic. (2 Marks)
iii. Adiabatic. (2 Marks)
d) Which of the following is a closed system? Select all that apply (3 Marks)
i. Pot of boiling water on a stove
ii. Pot of cold water on a countertop
iii. Helium-fillled myla balloon
iv. A cup of hot coffee
v. A glass of iced tea.
e) Write the equation for the gaseous equilibrium corresponding to each of the following
KP expression.
i. ???? =
(??????2)2
(??????2)2(????2)
(2 Marks)
ii. ???? =
???? ??2 (????2)4
??????4 (????2??)2 (2 Marks)
iii. ???? =
(??????)2
????2 (????2)
(2 Marks)
f) How is Gibb’s free energy change ??? and standard free energy change, ???0 related.
(2 Marks)
2
QUESTION TWO (20 MARKS)
a) If we combine 3.0L of NO and 1.5L of O2, and they react according to the balanced
equation.
2NO(g) +O2(g) 2NO2(g), what volume of NO2 will be produced.
(Assume that the reactants and products are at the same temperature and pressure).
(5 Marks)
b) There is a thermodynamic function of a system enthalpy (H) which is defined as
H = V+PV.
Define the terms and show that ???? = ???. Where ???? is the heat transferred between
the system and the surroundings? (8 Marks)
c) i) State Hess’s law. (2 Marks)
ii) Given the following thermodynamical equations
NO(g) +O3(g) NO2(g) + O2(g) ??? = -198.9????/??????
O3(g) 3
2 O2(g) ??? = -142.3????/??????
O2(g) 2O(g) ??? = +495????/??????
Determine the enthalpy change for the reaction. NO(g) + O(g) NO2(g).
(5 Marks)
QUESTION THREE (20 MARKS)
a) For a reaction
aA(g) + bB(g) cC(g) +dD(g); Write the reaction quotient. (3 Marks)
b) A mixture of 5.75 atm of H2 and 5.75atm of I2 is contained in a 1.0-L vessel at 4300C.
the equilibrium constant (Kp) for the reaction. H2(g) +I2(g) 2HI(g) at
this temperature is 54.3. Determine the equilibrium partial pressure of H2, I2 and HI.
(10 Marks)
c) Aspirin (acetylsalicylic acid, (HC9H7O4) is a weak acid. It ionizes in water according
to the equation HC9H7O4(aq) + H2O(aq) H3O+(aq) +C9H7O-
4 (aq). A 0.10m
aqueous solution of the aspirin has a pH of 2.27 at 250C. Determine the Ka of aspirin.
(7 Marks)
QUESTION FOUR (20 MARKS)
a) Explain the following terms
i. Spontaneous process. (2 Marks)
ii. Universe (2 Marks)
iii. Entropy (2 Marks)
b) Explain the following in a reactive process.
i. ??? is negative (3 Marks)
ii. ??? is positive (3 Marks)
iii. ??? is negative (3 Marks)
c) Explain the brösted acid-base concept. (5 Marks)
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