Abnormal molar mass

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Q. Define the following terms:
Abnormal molar mass

Q. Define the following terms:
(i) Molality (m)
(ii) Abnormal molar mass

(a) A $10 %$ solution (by mass) of sucrose in water has a freezing point of 269.15 K. Calculate the freezing point of $10 %$ glucose in water if the freezing point of pure water is 273.15 K.
given:
(Molar mass of sucrose = 342 g $m o l^{- 1}$ )
(Molar mass of glucose = 180 g $m o l^{- 1}$ )
(b) Define the following terms:
(i) Molality (m)
(ii) Abnormal molar mass.

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Q. Why is the molecular mass determined by measuring the colligative property in case of some solutes is abnormal?

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