1. The problem statement, all variables and given/known data Lets say at room temp an atom of hydrogen moves at 3000 m/s. Lets say all things the same except you replace the hydrogen with oxygen. The oxygen is about 16 times the molar mass than hydrogen. Does this mean that the oxygen will travel at (1/16)*3000 m/s? 3. The attempt at a solution This is not really a homework question but we are dealing with stuff like this in class and it has been confusing me. 1/16 times the original velocity is my guess.