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For gas laws
what is the unit for
1.volume
2. temp |
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Definition
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| give formula for average molecular speed of a gas |
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Definition
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| give the formula for root mean square speed |
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Definition
urms=√3RT/M
R=8.325 J/K.mol
Mass = kg/mol
T = must be converted to Kelvin |
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Definition
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. |
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Definition
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which gas will move faster:
Gas A: mass 1kg at 20k
Gas B: mass 3kg at 5K
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Definition
gas A
b/c it at a higher temp
smaller size |
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| Write ideal gas law including units |
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Definition
PV=nRT
P=atm
V= L
n=mol
R=8.315 J (K.mol)/ 0.0821 (L* atm)
T=K
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| Rearrange the ideal law to find changes in temp,pressure,volume, where moles is held constant |
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Definition
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Term
Rearrange the ideal law to solve for V2 , where temp ,pressure have a before and after value
(moles are held constant) |
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Definition
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| Formula how to calculate the molar mass of a gas using the density of a gas at STP |
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Definition
M=dstp/ 22.4stp
=
where vol is 22.4
d= density |
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Term
How do real gases behave during changes in pressure?
extremly high pressure? |
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Definition
as pressure rises:
particles come closer & condense into liquid
extremly high pressure:
gas's volume becomes bigger |
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| How do real gases behave during decreases in temp? (2) |
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Definition
as temp decrease:
gas condense into a liquid state
volume decreases |
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| what is the name of the equation that is used when a gas doesnt follow gas laws? |
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Definition
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| write the van der waals equation |
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Definition
(P + n2 a ) (V-nb)
V2
= nRT |
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If the molar mass of gas is increased, what occurs?
Is this behavior ideal? |
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Definition
↑ molecular mass=↑ collisions
= ↑ interactions
↑less ideal
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