Question

define:-
Molarity
Molality
Atomic mass unit

Answer 1

molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution

molality is a measure of concentration of a solute in solution in terms of amount of substance in a specified amount of mass of the solvent.

a unity of mass used to expres a atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12..

Answer 2

molarity is defined as the number of moles solute pre literof solutions
molality don't know?????
atomic mass unit- unit of mass to express the atomic weight....

hope it helps you