Q.

Molar mass of Na2SO4 dissolved in water is determined from depression of freezing point experiment. Molar mass of Na2SO4 observed can never be

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71 g

56.8 g

213 g

90 g

answer is C.

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Detailed Solution

Na2SO4 in water undergoes dissociation.∴ i ranges from 1 to 3i.e., i > 1i=MnormalMabnormal Mabnormal=Mnormali ∵ i is greater than 1, Mabnormal can never be greater than Mnormal (142)

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