How many formula units of sodium chloride are in 6.25moles?

An experimental procedure requires a 10 ml of acid to be dissolved

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

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