Chem Help Part 2

[agentb159]

First off let me say thanks for your help last week with my problem I had in chem. Now I have another one thats been a killer, that I can't seem to figure out

Problem: Combustion analysis of 1.00g of the male sex hormone testosterone, yeilds 2.90g of CO2 and 0.875g of H20. What are the mass percents of carbon, hydrogen, and oxygen, in testosterone.

Ok, so I figured out the percents of C, O, and H in CO2 and H20, and also found out how many grams of C, H, and O are in CO2 and H2O, but after that part im stumped on what to do on how to figure out the percents in testosterone. It's probably somehting very easy that I'm overseeing by looking to far into the problem or maybe not. ANy help will be apreciated.

Agentb

[daveleau]

Take each molecule separately. Find the percentage that Carbon takes up in a single molecule of CO2. Then take the 2.90g ad multiply it by the percentage that you get. This will tell you how much C there is. Do the same for Oxygen.
Then take the second molecule and find out what percentage Oxygen is in H20. Then multiply that number to .875 to get the amt of O present.
Then add the numbers for each molecule together (add the Oxygen numbers from each molecule together).