Question

A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.NCERT Class 9th Science Ch 2 Is Matter Around Us Pure

Answer 1

mass of solution = mass of solvent +mass of solute=
36+100=136g
concentration =36×100/136=26.47

Answer 2

Hey there!

Given,

Mass (solute) = 40 gram

Mass (solvent) = 320 gram

Mass (solution) = Mass (solute) + Mass (solvent)

                        = 40 gram + 320 gram

                        = 360 gram

∴ Mass % (solution) = [ Mass (solute)/Mass (solvent)] × 100

                                = [40/360] × 100

                                = 11.1 %

Hope It Helps You!