Question

What is the molality of a 10% (by weight) C$_6$H$_{12}$O solution (molecular weight = 90)?

• A. 0.012 m
• B. 0.12 m
• C. 1.2 m
• D. 12 m

Hint:

Molality is based on the mass of the solvent, not the volume of the solution, and is especially useful for temperature-independent calculations.

Answer 1

The Correct Option is C

Molality is defined as the number of moles of solute per kilogram of solvent. For a 10% (by weight) solution, the molality can be calculated as follows: \[ \text{Molality} = \frac{\text{moles of solute}}{\text{mass of solvent in kg}} \] The molality is calculated to be 1.2 m.