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2014-08-13T01:59:57+05:30

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Treating them as point masses along the separation line between the two:

Let the position of center of mass be x meters from hydrogen atom. Let center of mass be at position 0.

Mass of hydrogen * distance of H atom from center of mass + Mass of chlorine * distance of chlorine atom from center of mass = 0

1 * (- X - 0) + 35.5 * (1.27 * 10^-10 - X  - 0) = 0
- X + 35.5 * 1.27 * 10^-10 - 35.5 X = 0
36.6 X = 35.5 * 1.27 * 10^-10               
X = 3.47 * 10^-12 m
Center of mass is 1.23 * 10^-10 meters away from hydrogen atom.

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