Question

a solution contains 40 grams of common salt in 320 grams of water calculate the concentration in terms of mass by mass percentage of the solution

Answer 1

$= \frac{40}{320 + 40} = \frac{40}{360} \\ \% = \frac{40}{360} \times 100 = \frac{4000}{360} \\ = 11.11\% \: \: or \frac{100}{9} \%$
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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!