Question

To make a saturated solution, 15 g of sodium chloride is dissolved in 185g of water at 293K. The Concentration (in mass/mass %) of solution at this temperature is:

• A. 15
• B. 30
• C. 7.5
• D. 8

Answer 1

The correct option is C

7.5

Concentration $\frac{inmass}{mass}$ = $\frac{massofsolute}{massofsolute+massofsolvent}$ x 100 = $\frac{15}{15+185}$ x 100 = 7.5 %