Question

A mixture of krypton and neon gases contains krypton at a partial pressure of 460 mm Hg and neon at a partial pressure of 482 mm Hg. What is the mole fraction of each gas in the mixture? XKr =

XNe =

Answer 1

Solution:

According to Dalton's law, total pressure of the mixture of gases are equal to the sum of the partial pressures of the individual gases.

Thus,

Total pressure (P) = 460 mm Hg + 482 mm Hg = 942 mm Hg

Since,

Partial pressure of a gas = Mole fraction x Total pressure

Hence,  

Mole fraction (X) = Partial pressure /Total pressure

Thus,

For krypton gas,

Xkr = 460 mm Hg / 942 mm Hg =  0.488

For Neon gas,

XNe = 482 mm Hg / 942 mm Hg = 0.512