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2m urea solution is diluted from 2Kg to 5Kg by addition of water. calculate molality of diluted solution.

2m urea solution is diluted from 2Kg to 5Kg by addition of water. calculate molality of diluted solution.

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1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
molality is the number of moles of solute dissolved in 1 kg of solvent
Inchemistry, themolality,b(orm), of asolutionis defined as theamount of substance(inmol) of solute, divided by themass(inkg) of thesolvent, (notthe mass of the solution):

[b = \frac{n_{solute}}{m_{solvent}}]
now,
2=mole of urea/2
mole of urea=4

now new molality=4/5=.2 molal

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