[Malgrif]

I've tried a couple of things but i get stuck. horribly stuck =(.

When 6.853mg of sex hormone was burned in a combustion analysis, 19.73mg of CO2 and 6.391mg of H2O were obtained. The molecular mass was found to be 290. What is the molecular formula?

*so this is the reation i came up with
sex hormone + 2O2 -------> CO2          + 2H20
m=6.853mg                       m=19.73mg     m=6.391mg

*I added the two masses of the obtained compounds which i subtracted by the sex hormone mass to obtain the O2 mass, after that though i don't know how to obtain the molecular formula.

Explain the steps to me and anything else please... thank you.

[Borek]

Search forums for "empirical formula", this subject was discussed and explained on many occasions.

[Yggdrasil]

From the chemical reaction, you can see that all of the carbon in the CO₂ comes from the sex hormone and all of the hydrogen in the water comes from the sex hormone.  Given this information, can you find the masses of carbon, hydrogen, and oxygen present in the sex hormone.

[trungnd]

Can you explain for me about the chemical formula of fusine .Thank you

[AWK]

http://www.mpcfaculty.net/mark_bishop/combustion_analysis_example.htm