How many molecules are in 0.478 moles of nabr​

Motivation cannot be developed with practice; a person either possesses it or they do not.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Which type of intermolecular force is pbr3