Question

To interconvert the concentration units molality (m) and mass percent, you must also know the density of the solution. A) True B) False

Answer 1

The correct answer is option false.

Step-by-step explanation:

Molality of the solution defined as moles of substance present in 1 kilogram of solvent.

Moles =
`\frac{Mass of solute}}{\text{molar mass of solute}}`

`Molality=\frac{Moles}{\text{Mass of solvent(kg)}}`

Mass of percent (w/w%) of the solution is defined as amount of solute present in 100 grams of solution.

`(w/w\%)_=\frac{\text{Mass of solute}}{\text{Mass of solution}}* 100`

So, if want to inter-convert molality into mass percent we can do that without knowing density of solution.

Mass of solution = Mass of solute + Mass of solvent