You have just studied distribution of molecular speeds to know that you can have a probable speed v. = 2k, I an average speed v = 8 k, I and a m T M root-mean speed v. 3k T . Your research director informs you that the molecules of a sample of gas at 355 K have a root-mean-square (rms) speed m of 259 m/s and wants you to calculate the most probable speed and the average speed. Also, while you're at it and before lunch, you should calculate the mass of a molecule. he average speed is Drag answer here 259 The most probable speed is m/s. Drag answer here 211 The molecular mass is kg. Drag answer here 40 2.19 X 10 25 239 16