Question

Of the concentration units below, only ________ uses kg of solvent in its calculation.

A) mass %
B) ppm
C) ppb
D) molarity
E) molality

Answer 1

E) molality

Step-by-step explanation:

Molality -

Molarity of a substance , is the number of moles present in a Kg of solvent .

Hence , the formula for molality is given as follow -

m = n / s

m = molality

s = mass of solvent in Kg ,

n = moles of solute ,

Hence , from the given information of the question,

The concentration unit which have Kg of solvent , is molality.