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Please find the right answer of the following Problem

Problem- A solution is prepared from 0.75g of an unknown non electrolyte and 4.0 grams of lauric acid. The freezing point of this solution is, 40.6degC.

Part 1- Determine the molecular mass of the unknown.

Note that freezing point of pure lauric acid is 43.2degC and molality freezing point constant is 3.9degCkg/mo.

I need assist to compute the molecular mass of the unknown.

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