Question

What is zero point energy? Calculate the number of normal modes of

vibration for the following compounds:

(i) PF3 (ii) ClNO (iii) XeF2​

Answer 1

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Answer 2

Hey dear,

● Zero-point energy -
- It is the energy that remains when all other energy is removed from a system.

● Answer -
Number of modes of vibration for given compounds -
(i) PF3 => 6
(ii) CINO => 3
(iii) XeF2 => 4


● Explanation -
(i) PF3 -
- PF3 is trigonal pyramidal molecule.
- Vibrational degrees of freedom = 3×4-6 = 6

(ii) CINO -
- CINO is V-shaped molecule.
- Vibrational degrees of freedom = 3×3-6 = 3

(iii) XeF2 -
- XeF2 is a linear molecule.
- Vibrational degrees of freedom = 3×3-5 = 4

Hope this helped...