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 fraction⇒0.05
Number of moles of water⇒90018=50
∴nureanurea+50=0.05
nurea=2.63
Mass of urea=Wurea=2.63×60⇒157.8 g
Total mass of solution⇒157.8+900⇒1057.8 g
Volume of solution⇒1057.81.2ml⇒881.5 ml
Molarity⇒no. of moles of solutionsvolume of solution in L⇒2.630.8815⇒2.98 M

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

Doubts & Discussion

Loading discussions...