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Solutions

Question

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Define the following terms:
Molality

Solution

Answer:

Molality. The moles of the solute dissolved in one kilogram of the solvent is called the molality of the solution.
Moality = m =

\frac{Moles of B}{Mass of solvent in kg}

∵

Moles = \frac{Moles of B}{Molar mass of B} = \frac{ω_{B}}{M_{B}} m = \frac{ω_{B}}{M_{B} \times ω_{A}} where ω_{A} = Mass of solvent in kg .

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