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Louli
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

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