Question

A flask contains a mixture of neon Ne, krypton Kr, and radon Rn gases. (Hint: The molar mass of the Ne is 20.180 g/mol, of the Kr is 83.80g/mol, and of the Rn 222 g/mol )Compare the average kinetic energies of the Ne and Kr.

Answer 1

Answer:

Kinetic energies of all the gases are same.

Explanation:

The average kinetic energy of molecules of a gas is given by the formula:

K.E = (3/2)KT

where,

K.E = Average Kinetic Energy of the molecule

K = Boltzman's Constant = 1.38 x 10^-23 J/K

T = Absolute temperature of gas

Since, all the gases are in a mixture, and the temperature of the gases must be same and equal to the temperature of mixture.

Therefore, all the terms in the formula are constant and the Average Kinetic Eenergies of all the gases in the mixture (namely, Neon Ne, Krypton Kr, Radon Rn), equal.