question_answer 2)

In the  molecule, the separation between the nuclei of the two atoms is about . Find the approximate location of the CM of the molecule, given that the chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in all its nucleus.  

Answer:

As shown in Fig. 7.96, suppose the H nucleus is located at the origin. Then     Fig. 7.96 The position of the CM of  molecule is                 . Thus the CM of  is located on the line joining H and  nuclei at a distance of 1.235 A from the H nucleus.