Chemistry - Liquid Solution Question with Solution | TestHub

ChemistryLiquid SolutionMiscellaneous/MixedEasy2 minPYQ_2020
ChemistryEasysingle choice

The amount (in grams) of sucrose (mol wt.=342 g) that should be dissolved in100 gwater in order to produce a solution with a105.0 oCdifference between the freezing point and boiling point is
(Given thatK f =1.86 K kg mol 1 and K b =0.51 K kg mol 1 for water)

Options:

Answer:
B
Solution:

Boiling pointTb=100+Tb=100+kbm

Freezing pointTf=0-Tf=-kfm

Tb-Tf=100+kbm-(-kfm)

105=100+0.51 m+1.86 m

2.37m=5  or m=52.37=2.11

Weight of sucrose to be dissolved in100 gwater

=2.11×3421000×100=72.2 g

Stream:NTA_ABHYASSubject:ChemistryTopic:Liquid SolutionSubtopic:Miscellaneous/Mixed
2mℹ️ Source: PYQ_2020

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