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What is the molar mass of urea if the freezing point of a solution containing 15g...

What is the molar mass of urea if the freezing point of a solution containing 15g of urea in 100g of naphthalene is 64.5C? (freezing point of pure naphthalene is 80.6)

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Where delta T- freezing point depressin Delta T- 80.6-64.5 16.1 - freezing point depression constant 6.94 m -molality 16.1-6.

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