at 298K. [5 marks]
) react with
glucose ( 
). The unbalanced
half-reactions are
and 
.
The
reaction medium is slightly acidic. Balance the
reaction. [5 marks]
.
Show that for the combustion of carbohydrates
in a calorimeter 
.
Hint: The temperature in a calorimeter seldom rises
very far above room temperature. At these temperatures,
carbohydrates are solids and water is liquid. [4 marks]
). If the body were
perfectly insulated,
how long would it take
before a 70kg adult male reached the normal boiling
point of water from an
initial temperature of 
?
[6 marks] 
The ratio of ATP to ADP is held fixed at a value of 10 by
homeostatic mechanisms. The maximum observed
ratio of glycerol-1-phosphate
to glycerol is 770 at 
C. 
for
ATP hydrolysis
is -31.0kJ/mol at C. What is
for the direct reaction of glycerol with phosphate? [10 marks]
C, the equilibrium concentrations of the active
and inactive forms are, respectively,
and 
mol/L.
At 
C, the equilibrium concentrations of the active and
inactive forms are 
and 
mol/L.
What is 
for the process which converts
the active form to its inactive conformation? [10
marks]
and the
temperature of the exhaust
manifold is 
. What is the maximum
electrical power (measured in
W, i.e. in J/s) which such a generator might produce? The
density of ethanol is 790g/L and its molar mass is
46.069g/mol. [10 marks]
. What is the standard free energy
of formation of solid nickel (II) sulfide? [10 marks]
complexes:
These multimers are held together by weak intermolecular forces.
Suppose that the molar mass of a
certain enzyme has been determined to be 120kg/mol
from crystal structure data. A solution of 8.00g of enzyme in
100mL of water is prepared. The osmotic pressure of this
solution is 
at 298K. Does this enzyme
form multimers in solution? If so, what is the number
of enzyme molecules in each complex? [10 marks]
The concentration of zinc chloride in the left half-cell is
0.002mol/L. The right half-cell contains 
nitric acid. Bubbles of nitrogen
monoxide form on the inert platinum electrode. The pressure of
NO in these bubbles is approximately 0.9atm (the ambient
atmospheric pressure at our altitude). Assume that the NO gas
behaves ideally.
Calculate the voltage produced by this cell using Debye-Hückel
theory. [10 marks]
- Propane is a gas at room temperature. A fuel cell operates on propane at a pressure of 1atm at 298K. Assume that propane is an ideal gas and calculate the maximum electrical work available from the fuel cell per cubic metre of propane oxidized if the oxygen pressure is 0.2atm and the carbon dioxide pressure is 0.03atm. Hint: Calculate the maximum work per mole first. [7 marks]
- Calculate the voltage produced by the fuel cell under the operating conditions described above. [3 marks]
where V is the volume of the container in which the gas is
held, h is Planck's constant, 
, m is
the mass of the particles (atoms),
k is Boltzmann's constant and T is the
temperature.
Calculate the constant volume specific heat capacity
of an ideal gas.
Compare your answer to the experimental
value of 
.
Hint: The
identity 
may be useful.
[10 marks]
