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

Doubts & Discussion

Loading discussions...