In a rush, a student only measured the mass of the empty beaker once before beginning the experiment and one more time after the entire experiment was finished. The mass of
the empty beaker was found to be 0.123g less at the end of the experiment. What
happened?

The student measured the cup and got an incorrect answer

Explanation:

because he was in a rush.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.