You have a small but seemingly pure sample of an unknown white powder containing

Question

You have a small but seemingly pure sample of an unknown white powder containing only C, H, and O. To analyze the compound, you determine its empirical formula by analysis for C and H, and its molar mass by freezing point depression, (a) What is the empirical formula if a 0. 01510 g sample gives 0. 01102 g of H2O and 0. 04484 g of CO2 on combustion? (b) If you dissolve 1. 000 g of the powder in 100. 000 g of camphor, you find that the melting point of the solution is 177. 05 degree C. Pure camphor melts at 179. 75 degree C. The kfp, for camphor is 40. 0 deg/molal. What is the molar mass of the white powder? (c) What is the molecular formula of the white powder?

Explanation / Answer

d

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