Question 38
A solution contains 42 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution?
Solution
Mass of solute - NaCl $$=42gm$$
Mass of solvent - water $$=320$$ gm
Mass of solution $$=(42+320)$$ gm $$=362$$gm
Concentration in terms of Mass by mass percentage $$=\frac{mass of solute}{mass of solution} \times 100$$
$$=\frac{42}{362} \times 100=11.60\%$$
Option C is correct.
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