Question

Find the molality of the solution if 2.5 moles of CaBr2 are dissolved in 5 kg of water.

-500 m
-5 x 10-4 m
-0.5 m
-2 m

Answer 1

The rule to calculate molality is as follows:
molality = number of moles of solute / kg of solvent

From the givens:
number of moles of solute (CaBr2) = 2.5 moles
Kg of solvent (water) = 5 kg

Substituting by these givens in the above mentioned equation, we can calculate molality as follows:
molality = 2.5 / 5 = 0.5 m