Answer:
4 is the correct answer since that belongs to one of his postulates.
A kilogram is a unit of mass. A meter is a unit of measurement, a Liter is volume and a kelvin is temperature
Mass of sodium is 23 and mass of fluirine is 19 there mass of NaF is 42
42 g = 1 mole therefor 4.5 moles will have
4.5 × 42 = 189 g