1. The problem statement, all variables and given/known data The ideal gas has a density of 2.4 kgm–3 at a pressure of 2.0 × 105 Pa and a temperature of 300 K.Find the root mean square speed of the gas atoms. 2. Relevant equations p=(1/3)*(Nm/V)*v(squared) 3. The attempt at a solution I tried to make v(squared) the subject, but N(the number of atoms) is not given, and when I looked at the answer, it made v(squared) the subject, and omitted N. I don's understand why do they have to omit N, is it because we are suppose to find the speed for one atom? Sorry for my bad English.