Chemistry - Concentration Terms Question with Solution | TestHub

ChemistryConcentration TermsConcentration termEasy2 minPYQ_2019
ChemistryEasynumerical

The mole fraction of urea in an aqueous urea solution containing900 gof water is0.05. If the density of the solution is1.2 g cm-3, the molarity of urea solution is _______
(Given data: Molar masses of urea and water are60 g mol-1and18 g mol-1, respectively)

Answer:
2.98
Solution:

Mole fraction0.05
Number of moles of water90018=50
nureanurea+50=0.05
nurea=2.63
Mass of urea=Wurea=2.63×60157.8g
Total mass of solution157.8+9001057.8g
Volume of solution1057.81.2ml881.5ml
Molarityno.ofmolesofsolutionsvolumeofsolutioninL2.630.88152.98M

Stream:JEE_ADVSubject:ChemistryTopic:Concentration TermsSubtopic:Concentration term
2mℹ️ Source: PYQ_2019

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