How do you calculate the molar mass of a compound?

Calculate the molar mass of the unknown compound?

an aqueous solution containing 35.9 g of an unknown molecular (non-electrolyte) compound in 160.0 g of water was found to have a freezing point of -1.2 C. Find the molar mass of the ...show more
Answer:

I am following this calculation. Where did the 1.86 come from?

HIIN6GUWGI2RV2PJELOXKIUTSU at Yahoo! Answers Visit the source

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