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Gas **

Part 3

QuestionAnswer
Earth's radius 6370 Km
Earth's barometric pressure 760 mm Hg (density of Hg = 13.6 g/cm^3)
Molecular mass of air 29 g/mol
partial pressure of a gas the pressure exerted by a component of a mixture of gases
mole fraction n1/nt (partial pressure of one component of gas/total pressure)
Equation for partial pressure involving mole fraction (n1/nt)Pt = X1Pt
The Kinetic-Molecular Theory (the theory of moving molecules by Calusius) Gases consist of a lot of molecules (or atoms, in the case of the noble gases) that are in continuous random motion. Kinetic energy of the the molecules doesn't change w/time (as long as T is constant).
Kinetic-Molecular Theory - what if you have two gas samples, both at the same temp. then the kinetic energy for the collection of gas molecules in one sample is equal to the kinetic energy for the collection of gas molecules in the other sample.
To to measure hardness of that the molecules hit the wall V*M (velocity times mass of molecules)
if the temp. of a gas is doubled, then the kinetic energy of its molecules is...? doubled
root mean square speed = 1/2 mu^2
What happens when volume increases but the temp. is constant? pressure will decrease
What happens when temp. increase at a constant volume increase in pressure.
root mean square (rms) speed: (sqrt(3RT/M) M is the molar mass
effusion rate of escape of a gas through a tiny or or pinhole in its container
diffusion the speed of one substance through space, or through a second substance (such as the atm)
Which will effuse more rapidly, a lighter gas or a heavy gas a lighter gas
which will diffuse faster, lighter molecules or heavy ones lighter ones
Effusion rate equation (sqrt(1/M))
mean free path average distance traveled by a molecule
The higher the density of gas, the (blank) the mean free path smaller. (more likelyhood of a collision)
The deviation from ideal gas behavior is (blank) at high pressure large
As temp. increases the deviation from ideal behavior (blank) decreases
characteristics of ideal gases occupy no set volume, gas molecules have no attraction or repulsion for each other
Is the ideal gas equation good at high pressures? not really
How are P and V related at constant P? inversely proportional
How are P and T related at constant V? directly proportional
P and n are related how at constant V? directly proportional
how are gas density related to molar mass and pressure? density is proportional to molar mass and pressure
how are gas density related to temperature? density is inversely proportional to temperature
Molar mass = Density*R*T/P
Created by: Tiffastic