Calculate molality molarity and mole fraction of ki
Asked by admin @ in Chemistry viewed by 313 People
Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL -1 .
Answered by admin @
Molar Mass of Kl = 166 g/mol
Density = 1.202 g/ml
Mass/Mass % = 20%
Mass of solution = 100g
Mass of solute = 20g
Mass of solvent = 80g = 0.08 kg
Density = Mass of solution / Volume of solution
1.202 = 100 / V
V = 100/1.202
V = 83.19 ml
V = 0.083 L
Moles of Kl = Given mass/Molar Mass = 20/166 = 0.12
-----------------------------------------------------
a) Molality = Moles of Kl /Mass of solvent (Kg)
= 0.12 / 0.08
= 1.5 m
-----------------------------------------------------
b) Molarity = Moles of solute / Volume of solution
= 0.12 / 0.083
= 1.44 M
------------------------------------------------------
c) Mole Fraction = Mole of solute / Moles of solute + Moles of solvent
= 0.12 / ( 0.12 + 4.44 )
= 0.12 / 4.56
= 0.026
-------------------------------------------------------
Thanks !
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