Chemistry 520
Winter Quarter 2008
Take Home Quiz 2
This quiz is due no later than 4 pm on Friday, Feb. 1, 2008 in room 0048 McPherson lab.
Write down first the mathematical equation with symbols and leave the numerical substitution at the end.
Submit your answers on single sided paper.
1. A sample of CH
4(
g
)
having a volume of 2.80 liters at 25
◦
C and 1.65 atm, was ignited with a sample of oxygen
gas having a volume of 35.0 liters at 31
◦
C and 1.25 atm to produce CO
2
and H
2
O vapor. Calculate the volume
of CO
2
formed at a pressure of 2.50 atm and a temperature of 125
◦
C.
2. Estimate the molar volume of CO
2
at 500 K and 100 atm by treating it as a van der Waals gas.
3. Assume that a nitrogen molecule acts as a hard sphere with radius 1.60
˚
A. If you have a vacuum chamber that
is 1.00 m on a side, to what pressure would it have to be pumped down in order that a nitrogen molecule has
a reasonable chance of not colliding with another nitrogen molecule going from one side to the other (that is,
the mean free path is 1.00 m)? Assume a temperature of 22.0
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 Spring '08
 GRANDINETTI
 Physical chemistry, Thermodynamics, Enthalpy, pH, CH3 CH2 CH3, standard reaction enthalpy

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