Concentration in part per million and mass percentage

Express the concentration of a 0.0270 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.

Thank you!

To convert from M (moles per liter) to g/liter multiply by the atomic weight (F=19)
0.0270 moles/liter x 19g/mole = 0.513 grams/liter
A liter is 1000 mL, and mass percentage is parts per hundred (1% = 10000 parts per million)
A liter weight 1000g
Mass percentage F =(0.513 g / 1000g) *100/1% = 0.0513mass%
parts per million is 10000 time the % = 513 ppm