dalton's law key.notebook
Table of All Gas Laws and STP
February 24, 2014
dalton's law key.notebook
February 24, 2014
Time for the Last Two Gas Laws
So far we have only talked about gas laws pertaining to only one type of gas, but what so we do if we have a mixture of gases?
Dalton's Law of Partial Pressures
Ptotal = Pgas 1 + Pgas 2 + Pgas n .....
Essentially, sum up all pressures for each gas in the mix to get the total. Or you can find one of the gases if you are given the total.
Example: The pressure of a mixture of nitrogen, carbon dioxide, and oxygen is 150 kPa. What is the partial pressure of oxygen if the partial pressures of the nitrogen and carbon dioxide are 100 kPA and 24 kPa, respectively?
dalton's law key.notebook
February 24, 2014
Dalton has a second gas law that involves moles.
First, let me introduce the mole fraction, represented by a X.
Each gas in the mixture has a different mole fraction
Mole fraction is number of moles of one gas compared to the total number of moles.
Ex. You mix together 0.5 moles of He, 1.0 moles of N2, and 3.0 moles of O2, what is the mole fraction of N2? Dalton's second law combines his first law with this idea of mole fractions.
P1 = Ptotal * X1
A tank contains 480.0 grams of oxygen and 80.00 grams of helium at a total pressure of 7.00 atmospheres. Calculate the following.
a) How many moles of O2 are in the tank?
b) How many moles of He are in the tank?
c) Total moles of gas in tank.
d) Mole fraction of O2.
e) Mole fraction of He.
f) Partial pressure of O2.
g) Partial pressure of He.
dalton's law key.notebook
February 24, 2014