Chpt 5 - Gases. Gas Law Development Dalton’s Partial pressure law Graham’s effusion Kinetic Theory Root-mean-square velocity van der Waals equation of state HW: Chpt 5 - pg 119-128, #s 5, 22, 23, 25, 31, 32, 35, 39, 41, 46, 55, 64, 66, 71, 75, 77, 81, 91, 95, 97, 101, 124 Due Mon 9/28.
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Pressure is? Units?
The height in mm of mercury
above the surface of the resevoir
of mercury determines the pressure.
The units are mmHg.
mmHg is also the same unit as
Torr. i.e. standard pressure is 760 mmHg and 760 Torr
Similar to the barometer,
the height difference of the Hg relates the pressure difference in the unknown gas bulb side to the current atmospheric pressure.
The higher Hg side has the _____ pressure.
P1V1 = P2V2
V1 = V2
P1V1 = P2V2
Avogadro’s Law - equal volumes of gas contain equal particles of gas
V = k n
At constant temperature and pressure the volume is directly proportional to the number of moles of gas.
PV=R or PV=nRT
nTR =0.0821 l*atm/mol*K
If more than one type of gas or more than one isotope, which gas effuses faster?
Lighter gas moves
KE = 1/2 mv2