Of the concentration units below, only uses kg of solvent in its calculation.
a) mass %
b) ppm
c) ppb
d) molarity
e) molality

E) molality

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.

explanation:

0.07 g/cm³

1.37 g/cm³