Exam 3 v0
CHE 132 General Chemistry II
Stony Brook University, April 22, 2004
Information:
A Periodic Table of the Elements
A Table of Standard Reduction Potentials.
STP for gases = 273.15 K and 1 atm
1 mile = 1.609 km
1 atm = 1.013x10
5
Pa = 760 torr = 14.7 lbs/in
2
= 1.01 bar
Gas constant = R = 8.314 J/mol K = 0.08206 L atm/mol K
Boltzmann constant k = R/N
A
= 1.381x10
23
J/K
Avogadro’s Number = N
A
= 6.022x10
23
/mol
Electron charge = e = 1.602x10
19
C
Faraday constant = F = e x N
A
= 96,485 C/mol
∆
G
o
= nFE
o
∆
G
o
= RTlnK
eq
∆
G =
∆
G
o
+ RTlnQ
Nernst equation:
E = E
o
– (RT/nF)lnQ
E = E
o
– (0.0592 V/n)logQ at 25
o
C
1.
Which one of the following statements is not
correct?
a)
Pressure is the total force on a surface.
b)
Newton (kg m/s
2
) is the unit of force, and Pascal (kg/m s
2
) is the unit of pressure.
c)
Gases exert pressure on the walls of a container due to the momentum (which is mass times
velocity) of the gas particles (i.e. gas atoms or molecules).
d)
The pressure of an ideal gas is independent of the molar mass because the mean square
velocity of the gas particles is inversely proportional to their mass.
e)
In a mixture of gases, the pressure due to each gas is proportional to the mole fraction of that
gas in the mixture.
2.
Which one of the following statements is not
correct according to the Ideal Gas Law for a gas
cylinder of fixed volume filled with one mole of oxygen.
a)
When the temperature of the cylinder changes from 15
o
C to 30
o
C, the pressure inside the
cylinder doubles.
b)
When a second mole of oxygen is added to the cylinder, the ratio P/T doubles.
c)
An identical cylinder filled with the double the pressure of hydrogen contains twice as many
molecules.
d)
When a second mole of oxygen is added to the cylinder, the ratio T/P decreases by 50%.
e)
If half the oxygen is replaced by an equal amount of nitrogen, the pressure doesn’t change.
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It is interesting and informative to compare molecular speeds with speeds of familiar things like
cars.
What is the rms (root mean square) speed of oxygen molecules at 300 K in miles per hour?
a)
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 Spring '08
 LaceyandHanson
 Electrochemistry, Periodic Table, pH, correct answer differs

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