Homework Help: AP Chemistry

Posted by some kid on Monday, January 5, 2009 at 11:07pm.

An unknown compound contains only the three elements C,H, and O. A pure sample of the compound is analyzed and found to be 65.60 percent C and 9.44 percent H by mass.

a.)Determine the empirical formula of the compound.

b.)A solution of 1.570 grams of the compound in 16.08 grams of camphor is observed to freeze at a temperature 15.2 Celsius below the normal freezing point of pure camphor. Determine the molar mass and apparent molecular formula of the compound. (The molal freezing-point depression constant, kf, for camphor is 40.0 kg-K-mol-1.)

c.)When 1.570 grams of the compound is vaporized at 300 °C and 1.00 atmosphere, the gas occupies a volume of 577 milliliters. What is the molar mass of the compound based on this result?

d.)Briefly describe what occurs in solution that accounts for the difference between the results obtained in parts (b) and (c).

PLEASE SHOW ALL WORK AND DO AS MUCH AS YOU CAN! THANK YOU!

AP Chemistry - DrBob222, Monday, January 5, 2009 at 11:43pm
I can work these problems. But no one here will do the work for you. We will help you through them if you will show your work to the point that you don't know what to do, then explain in detail what you don't understand about the next step.

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