In a solution of NaClO₄prepared by dissolving 125 g of sodium perchlorate monohydrate in 500.0 g water, what is the solution molality?

Question

Quizplus · Accepted Answer

First, we need to calculate the moles of NaClO₄:
moles NaClO₄ = (mass of NaClO₄ / molar mass of NaClO₄) = (125 g / 122.44 g/mol) = 1.0215 mol

Next, we need to calculate the mass of water in kg:
mass of water = 500.0 g = 0.5 kg

Finally, we can calculate the molality:
molality = (moles of solute / mass of solvent in kg) = (1.0215 mol / 0.5 kg) = 2.043 m

Therefore, the best choice is C, with a solution molality of 1.78 m.

In a Solution of NaClO4 prepared by Dissolving 125 G