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For questions about the dipole moment of a bond or a molecule; its calculation, comparison with other bonds or molecules, affect on molecular properties, etc.
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Why does AsH3 have a higher boiling point than HBr?
The As-H bond has an even smaller difference, so it can't experience these tiny permanent dipole attractions. … So if both AsH3 and HBr experience similar London forces, but HBr also experiences weak permanent dipole-dipole interactions, why does AsH3 ($\mathrm{-63^\circ C}$) have a slightly higher boiling point …