Now, a weight by volume percent concentration is defined as mass of solute per volume of solution. In this case, a
Now, since molarity is determined by liters of solution, it's easier to take a
Since you know that
#9.000color(red)(cancel(color(black)("g NaCl"))) * "1 mole NaCl"/(58.44color(red)(cancel(color(black)("g NaCl")))) = "0.154 moles NaCl"#
This means that the sample's molarity will be
#c = n/V#
#c = "0.154 moles"/"1.00 L" = color(green)("0.154 M")#
SIDE NOTE The result must be exactly the same regardless of the volume sample you pick for the solution. I recommend using different volume samples to test this out.