Question

the solution contains 40 gram of common salt and in the water of 320 gram calculate the concentration of the mass by mass percent

Answer 1

11.1% is the concentration fo solution by mass by mass percent.This is done by-- 40 divided by 320+40 multipied by 100.

Answer 2

Concentration =mass of solute /mass of solution *100
Concentration =40/320*100
=5/4
=1.25