Physics 11.6 question #23f

Question

A gas consists of a mixture of neon and argon. The rms speed of the neon atoms is 420 m/s.

What is the rms speed of the argon atoms?

Answer 1

Known:

R = 8.31 J/(mol*K)

M(Ne) ≈ 18kg/mol

M(Ar) ≈ 36kg/mol

The general formula for root-mean-square velocity:

v(rms) = sqrt([3*R*T]/M)

Rearrange & solve for temp (T) first by using the values for neon (Ne).

Then use that temp to solve for v(rms) for argon (Ar).