Question

A solution of H2SO4 is labeled 40% the density of solution is 1.3gm/l what is the concentration of the solution %m/v

Answer 1

as solution is 40% of H2SO4 which means 40 ml H2SO4 in 100ml.
density=mass/vol
density=1.3g/ml
1.3=mass/40; mass=52 g
total volume of solution is = 100ml
so %m/v = 52/100 * 100 = 52%

Answer 2

Hope this is helpful