The Average Speed at Which a Nitrogen Molecule Effuses at 30.0

Multiple Choice

The average speed at which a nitrogen molecule effuses at 30.0 °C is 480 meters per second. The average speed at which a butene molecule (C₄H₈) effuses at this same temperature should therefore be

A) 120 m s^-1.
B) 170 m s^-1.
C) 240 m s^-1.
D) 339 m s^-1.
E) 679 m s^-1.