In the `HCI` molecule, the separation between the nuclei of the two atoms is about `1.27Å (1Å = 10^(-10)m)`. Find the approximate location of the c.m of the molecule, given that a chlorine atom is about `35.5` times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus ?

Options

A. `1Å`
B. `2.5Å`
C. `1.24Å`
D. `1.5Å`

Answer

C

Explanation

Since, `m_(H) r_(H)=m_(Cl) r_(Cl)`
`implies m_(H)x=35.5m_(H)(1.27-x)`
`implies36.5x=35.5xx1.27`
`implies x=1.24 Å`