To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.

Mass of solute (sodium chloride) = 36 g (Given)

Mass of solvent (water) = 100 g (Given)

Then, mass of solution = Mass of solute + Mass of solvent

= (36 + 100) g

= 136 g

Therefore, concentration (mass by mass percentage) of the solution

= {𝑀𝑎𝑠𝑠\ 𝑜𝑓\ 𝑠𝑜𝑙𝑢𝑡𝑒 \over 𝑀𝑎𝑠s\ 𝑜𝑓\ 𝑠𝑜𝑙𝑣𝑒𝑛𝑡} × 100 %

={36\over136} × 100 %

= 26.4 %