CM2004
Department of Chemistry
UNIVERSITY COLLEGE CORK
TO BE HANDED IN TO ROOM 206 BY NOON ON 12 DECEMBER 2008
States of Matter: Gases
Coursework
1. A gas at 250K and 15atm pressure has a molar volume 12% smaller than that
calculated for the equation of State of an ideal gas. Hence calculate:
(i)
(ii)
the compressibility factor (Z) for this temperature and pressure
the molar volume of the gas.
2. In order to determine the collision frequency for a particular molecule under set
conditions of pressure and temperature, we introduce a variable termed the relative mean
speed. Why do we do this?
Molecular oxygen has a collision cross-section of 4.0 x 10-19 m2. Calculate  for
molecular oxygen at 330K and 101.325kPa.
(R: 8.3145 JK-1mol-1; L: 6.022 x 1023 mol-1)