what is the concentration in ppm of a solution which is prepared by dissolving in 15mg of nacl in 200ml water

Explanation:

In weight/volume (w/v) terms,

   1 ppm = 1g m-3 = 1 mg L-1 = 1 μg mL-1

200 mL = 0.2 L

15 / 0.2 mg L-1 =75 ppm

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )