Concentration of the solution

Question

A solution of formic acid, HCHO2, is 23.6 M and has a density of 1.20 g/ml. What is the concentration of the solution in terms of percent HCHO2 by mass?

Answer 1

23.6 mol /L  x 46 g/mol =1085.6 g/L of formic acid in this solution

1085.6 g/Lx 100 / 1200 g/L = 90.5 % by mass