Question

A solution contains 40g of common salt in 320g of water.Calculate the concentration in terms of mass by mass %

Answer 1

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 %

Answer 2

Answer:

The concentration in the terms of mass by mass% will be equal to 11.1%.

Explanation:

Given that the mass of salt(solute) = 40grams

Mass of the water ( solvent) =320 grams

We know that

Mass of solution = Mass of solvent + Mass of solute

Therefore Mass of Solution=40+320=360grams

Now

Mass/Mass %= (Mass of solute/Mass of solution)×100

=$\frac{40}{360}\times 100 = 11.1\%$