Mixture of ideal gases

Basic assumption is that the gases in the mixture do not interact with each other.

Consider a mixture with components l = 1,2,3... with masses m₁, m₂, m₃ ...m_i and with number of moles.

The total mixture occupies a volume V, has a total pressure P and temperature T (which is also the temperature of each of the component species)

The total mass

(34.1)

Total number of mole N

(34.2)

Mass fraction of species i

(34.3)

Mole fraction of species i

(34.4)

The mass and number of moles of species i are related by

(34.5)

is the number of moles of species i and is the molar mass of species i

Also to be noted

and

(34.6)

We can also define a molar mass of the mixture as

(34.7)

or,

or,

(34.8)