In a 0.1 molar solution of NaCl in water, which of the following will be closest to 0.1?
A) the molality of NaCl
B) the mass percent of NaCl
C) the mole fraction of NaCl
D) the mass fraction of NaCl
E) All of these are about 0.1.

Question

Quizplus · Accepted Answer

Molality is defined as moles of solute per kilogram of solvent. Since the density of water is close to 1 kg/L, a 0.1 molar solution of NaCl (which means 0.1 moles of NaCl per liter of solution) will have a molality close to 0.1 moles per kilogram of water, assuming the solution's volume is not significantly affected by the addition of NaCl. The other options (mass percent, mole fraction, and mass fraction) will not be close to 0.1 due to the differences in definitions and the significant mass of water compared to NaCl in the solution.

In a 01 Molar Solution of NaCl in Water, Which of the of the Following