3R physics question

[qinnu]

Question 19

It is asking you to guess the observed dipole moment of HF. I agree that CL is less electronegative. However Cl has an extra electron layer and hence bigger than F. Dipole is charge X speparation distance. I don't understand how you could say for sure that HCl should have a smaller dipole than HF.

Qinnu

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[Nuel]

Compared to chlorine, fluorine is more electronegative, hence a greater dipole moment when it's bonded to H.