Ratio of RMS Speed of Oxygen to Nitrogen Molecules

[Pseudopro]

Homework Statement

A container is filled with a mixture of nitrogen and oxygen. What is the ratio of the rms speed of oxygen molecules to that of nitrogen molecules? (Molar mass of oxygen=32gmol^-1; molar mass of nitrogen=28gmol^-1).

Homework Equations

v²=(v₁²+v₂²+...+v_N²)/N

The Attempt at a Solution

Tried using momentum mv=mv but doesn't make sense to do that (even more because the question asks for rms speed) Answer is 0.935. Can't think of sensible ways to use rms speed equation provided above. The question doesn't even specify number of molecules of each so very confused. Please help...

 

[rock.freak667]

You can express the RMS speed in terms of different quantities.

RMS speed, see the first formula.

 

[Pseudopro]

Thanks