# Gases and Equilibria: chem core 1a

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pV=
=nRT
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(p1V1)/T1 =
= (p2V2)/T2
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Dalton's Law
ptotal = p1 + p2
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Mole fraction (no units)
Xa=na/ntotal
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pa=
Xa x ptotal
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pV=
1/3 nMc^2 = nRT
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rate of effusion=
√(1/M). (where M is molar mass)
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van den Waals equation of state
{p+(an^2)/V^2} (V-nb)
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R
8.314 JK^-1mol^-1
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1N
mass x acceleration = kgms^-2
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k theta
standard equilibrium constant
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k delta is defined in terms of
activities (no units)
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k delta =
activity of products^no moles/activity of reagents^no moles
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activity of a pure solid
1
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activity of a pure liquid
1
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activity of a perfect gas
p/pdelta ( where pdelta=1 bar=1x10^5Pa)
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activity of solution of A (ideal dilute solution)
[A]/[A]delta. (where [A]delta =1moldm^-3)
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Kp
equilibrium constant
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kp=
Kc(RT)^∆n
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z=
collision frequency, s^-1
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1/z=
time of flight, s
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lambda=
mean free path, m (varies with pressure)
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root mean square (RMS) speed=
c=lambda x z
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## Other cards in this set

(p1V1)/T1 =

= (p2V2)/T2

Dalton's Law

### Card 4

#### Front

Mole fraction (no units)

pa=