Equal Numbers of Moles of Nitrogen and Oxygen (Molecular Masses

Multiple Choice

Equal numbers of moles of nitrogen and oxygen (molecular masses about 28 and 32 respectively) are placed in two different containers. The nitrogen molecules are kept at 20^oC. If the oxygen and nitrogen molecules have the same rms speed, the temperature of the container with oxygen molecules is

A) 20^oC.
B) 23^oC.
C) 31^oC.
D) 62^oC.
E) 93^oC.