Molarity (M) = (Number of solute)\/(volume of solution in litres) where in It is defined as the number of moles of the solute in 1 litre of the solution. No. of molecules (given) =6.02×1020 No. of moles =
6.02×1020
6.02×1023
=10−3 mol Volume of solution=100 ml=0.1L Therefore, Molarity =