Posted by Anonymous on Wednesday, December 5, 2012 at 7:55pm.
The molecules of a certain gas sample at 367 K have a rootmeansquare (rms) speed of 261 m/s. Calculate the most probable speed and the mass of a molecule.

Chemistry Help  DrBob222, Wednesday, December 5, 2012 at 9:53pm
rms = sqrt(3kT/m)
k is the Boltzman constant (look that up)
T is given in kelvin.
m is the mass of 1 molecule. Solve for that.
The average speed is (rms)^2