Molecular Speeds: Eleven Molecules Have Speeds 16, 17, 18

Multiple Choice

Molecular speeds: Eleven molecules have speeds 16, 17, 18, . . . , 26 m/s. Calculate the root-mean-square of this group of molecules.

A) 21.2 m/s
B) 21.0 m/s
C) 21.5 m/s
D) 21.7 m/s