Suppose you are given two flasks at the same temperature, one of volume 2 L and the other of volume 3 L. The 2-L flask contains 4.8 g of gas, and the gas pressure is X atm. The 3-L flask contains 0.36 g of gas, and the gas pressure is 0.1X. Do the two gases have the same molar mass? If not, which contains the gas of higher molar mass?

Explanation:

The given data is as follows.

          = 2 L,     = 3 L,        

        = X,           = 0.1 X,

        = 4.8 g,       = 0.36 g,

      = ?,               = ?

According to the ideal gas equation,

                            = 2

or,              

Thus, we can conclude that two gases does not have the same molar mass and flask 1 contains a gas of higher molar mass.

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