8
Chem 210 Jasperse Ch. 10 Handouts
Key Gas Math Summary
STP: Standard Temperature and Pressure
• 0º C (273 K)
• 1 atmosphere (760 mm Hg)
• 1 mole == 22.4 L for an ideal gas at STP
Several Key Conversion Factors When Dealing with Gases
Conversion Factors
1.
1.0atm = 760 mm Hg
2.
K = 273 + ºC
3.
4.
x moles =
Interconversion Between:
Pressure units
Temperature units
Mass/mole interconversions
actual mass
known molar mass
1 mole = 22.4 L at STP
mole/volume interconversions at STP
!
The Ideal
Gas Law
Rearranged
Versions
PV = nRT
V=
nRT
P
P=
P = Pressure (atm)
!
V = Volume!(L)
n = moles
R = gas constant = 0.0821 atm•L/mol•K
T = Temperature (Kelvin)
nRT
V
Density = g/L
PV = constant
V/T = constant
V/n = constant
PV/T = constant
PV
RT
The correct units are essential. Be
! whatever units!you
sure to convert
start with into the appropriate units
when using the ideal gas law.
R = 0.0821 atm•L/mol•K
Basic Gas Laws:
V ∞ 1/P
or
V∞T
or
V∞n
or
V ∞ T/P
or
n=
Boyle’s Law
Charles’s Law
Avogardro’s Law
Combined Law
T=
PV
nR