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Define (i) Mole fraction (ii) Molali...

Define
(i) Mole fraction
(ii) Molality
(iii) Raoult's law
(b) Assuming complete dissociation, calculate the expected freezing point of a solution prepared by dissolving 6.00 g of Glauber's salt, `Na_(2)SO_(4).10 H_(2)O` in 0.100 kg of water. (`K_(f)` for water =`1.86 K kg "mol"^(-1)`, Atomic massess : Na=23, S=32, O=16 , H=1)

Text Solution

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(a) (i) Mole fraction : It is defened as no of moles of component to the total on of moles of all the comporents.
(ii) Molality =`("Moles of solute")/("Mass of soluent (kg)")`
(iii) The partial pressure of a volatile component is directly proportional to its mole fraction is solution.
(b) Molar Mass `Na_(2), SO_(4) 10H_(2)O =322` g/mol
`NB=(6)/(322)"mol". i=3 D Tf=ik_(f)m.=3xx1.86xx(6)/(322xx0.10)=1.04 k`
Freezing point of soluten =273.15-1.04=272.1 K
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