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InformaTION:

5. DALTON’S LAW OF ​PARTIAL PRESSURE

Did you know?

  • Based on the kinetic theory of gasses, a gas will diffuse in a ​container to fill up the space it is in and does not have any ​forces of attraction between the molecules. In other words, ​the different molecules in a mixture of gasses are so far apart ​that they act independently; they do not react with each other.


  • The pressure of an ideal gas is determined by its collisions with ​the container, not collisions with molecules of other ​substances since there are no other collisions, A gas will ​expand to fill the container it is in without affecting the ​pressure of another gas






  • So, it can be concluded that the pressure of a certain gas is ​based on the number of moles of that gas and the volume and ​temperature of the system Since the gasses in a mixture of ​gasses are in one container, the volume (V) and temperature ​(T) for the different gasses are the same as well.



Each gas exerts its own pressure on the system, which can be ​added up to find the total pressure of mixture of gasses in a ​container. This is shown by the equation:

Ptotal = P1+P2+P3…+Pn