For gas laws
what is the unit for
1.volume
2. temp



give formula for average molecular speed of a gas 


give the formula for root mean square speed 

u_{rms}=√3RT/M
R=8.325 J/K.mol
Mass = kg/mol
T = must be converted to Kelvin



based on:
heavier gases diffuse more slowly than lighter gases b/c of their differing average speeds.
Graham: the rates of gases at which gas diffuse are inversely proportional to the square root of their molar masses.



r_{1} /r_{2} =√M_{2}/ M_{1} 

which gas will move faster:
Gas A: mass 1kg at 20k
Gas B: mass 3kg at 5K


gas A
b/c it at a higher temp
smaller size


Write ideal gas law including units 

PV=nRT
P=atm
V= L
n=mol
R=8.315 J (K.mol)/ 0.0821 (L* atm)
T=K


Rearrange the ideal law to find changes in temp,pressure,volume, where moles is held constant 

P_{1}V_{1} = P_{2}V_{2}
T1 T_{2}


Rearrange the ideal law to solve for V2 , where temp ,pressure have a before and after value
(moles are held constant)


V_{2}=V_{1} (P_{1/} P_{2}) (T_{1} / T_{2}) 

Formula how to calculate the molar mass of a gas using the density of a gas at STP 

M=d_{stp}/_{ 22.4}_{stp}
=
where vol is 22.4
d= density


How do real gases behave during changes in pressure?
extremly high pressure?


as pressure rises:
particles come closer & condense into liquid
extremly high pressure:
gas’s volume becomes bigger


How do real gases behave during decreases ; ;in temp? (2) 

as temp decrease:;
gas condense into a liquid state
volume decreases


what is the ;name of the equation that is used when a gas ;doesnt follow gas laws? 


write the van der waals equation 

(P + n^{2} a ) ; (Vnb) ;
V^{2}
;
= nRT


If the molar mass of gas is increased, what occurs?;
Is this behavior ideal?


; molecular mass=; collisions
=;; interactions
;less ideal
;

