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University of Alberta

Accounting

ACCTG418

Gail Amort- Larson

Winter

Description

This weekend, Daylight Saving ends. I get an hour of
sleep, you get an extra hour to study for the final.
Bizarro By Dan Piraro
Read sections 5.5, 5.6, 12.3
Practice PS #5 is posted 1 2
Real gases
Ideal gas law useful for ordinary conditions. See table 5.3 from Silberberg
Remember:
Ideal gas law is accurate to ~1.5% for gases under 20
atm AND 50C above their boiling points.
Idealasw nVT
Molar volume at STP Vm = 22.414 L
STP = standard temperature and pressure (for gases)
0C and 1 atm
3 4
See fig 5.23 Temperature effect
PV PV
Compressibility factor Z = = m
nRT RT
Essentially, we are plotting the deviation from the
ideal gas law. 5 6
The closer a gas is to the liquid state the more it will The most famous equation is the van der Waals
deviate from the ideal gas law. equation.
2
an
(P+ V2 )(V – nb) = nRT
Corrections to describe the behavior of gases are
an2
called equations rather than laws. These equations P + 2 adjusting measured P up to account for
V
are good for limited ranges but within those ranges interactions
are better than the ideal gas law.
larger a stronger attractions
V – nb adjusting V down to account for the volume
Most corrections account for the finite volume of the
ofolecules
molecules and for the attractive forces between the
larger b larger molecular size
molecules.
a, b are parameters specific and different for each gas
molecule
7 8
See figure 5.25 Compare the pressures predicted for 0.8 L of Cl
2
weighing 17.5g at 273.15 K using (a) the ideal gas
equation and (b) the van der Waals equation.
17.5 g
First fi

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