## Gas Laws

 For gas laws what is the unit for 1.volume 2. temp
 1. L or ml 2.K
 give formula for average molecular speed of a gas
 KE= 1/2 mv2 = 3/2 kT
 give the formula for root mean square speed
 urms=√3RT/M R=8.325 J/K.mol Mass = kg/mol T = must be converted to Kelvin
 what is Graham’s law?
 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.
 formula for graham’s law
 r1 /r2 =√M2/ M1
 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
 P1V1  =     P2V2 T1      T2
 Rearrange the ideal law to solve for V2 , where  temp ,pressure have a before and after value (moles are held constant)
 V2=V1 (P1/ P2) (T1 / T2)
 Formula how to calculate the molar mass of a gas using the density of a gas at STP
 M=dstp/ 22.4stp   = where vol is 22.4 d= density
 How do real gases behave during changes  in pressure? extremly high pressure?
 as pressure rises: Let us write you a custom essay sample on Gas Laws For Only \$13.90/page ORDER NOW 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?
 van der waals
 write the van der waals equation
 (P + n2 a ) ; (V-nb) ; V2 ; = nRT
 If the molar mass of gas is increased, what occurs?; Is this behavior ideal?
 ; molecular mass=; collisions =;; interactions ;less ideal ;
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