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A non-volatile solute' tetrameres in wat...

A non-volatile solute' tetrameres in water to the extent of `80%` 2.5 g of 'A' in 100 g of water , lowers the freezing point by `0.3^@C`. The molar mass of A in g `mol^(-1)` is (`K_f` for water =1.86 K kg `"mol"^(-1)`)

A

62

B

155

C

221

D

354

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A
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