Calculate molality of one litre of solution containing 200 gm CaBr 2 . Given density of solution equal to 1.0 gm / ml (Atomic mass of Ca = 40 , Br = 80 )

Question

Calculate molality of one litre of solution containing 200 gm CaBr 2 ​ . Given density of solution equal to 1.0 gm / ml (Atomic mass of Ca = 40 , Br = 80 )

TestHub · Accepted Answer

Question Explanation: Find molality.

Concept: This question is based on the interconversion of concentration terms.

Solution:

Molality = mole of solute / mass of solvent (kg)

Mass of solution = $d \times v$

$= 1 \times 1000 = 1000 g = 1 k g$

Mass of solvent = $1000 - 200 = 800 g$

Molality = $\frac{200}{200} \times \frac{1000}{( 1000 - 200 )} = 1.25 m$

Final Answer: Option (b)

Chemistry - Concentration Terms Question with Solution | TestHub

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