Past exam of the chemistry A course of the University of Cambridge / 2023 / Paper 1 / A3 / b / i

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- Solution i

Solution

All three fluorine atoms are at perpendicular distance

R

from the axis normal to the molecular plane. Boron lies on the axis, so it contributes zero. Thus

I_{c} = 3 m_{F} R^{2} .

The boron mass does not enter this moment, rather than needing to be approximated or neglected.

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