Homework Help: AP Chem

Posted by Anna on Sunday, October 5, 2008 at 6:21pm.

Combustion of 6.38 mg of ethylene glycol gives 9.06 mg CO2 and 5.58 mg H20. The compound contains only C, H, and O. What are the mass percentages of the elements in ethylene glycol?

AP Chem - Temisan, Sunday, October 5, 2008 at 6:24pm
make a mol fraction and then multiply by 100
AP Chem - Anna, Sunday, October 5, 2008 at 6:27pm
but don't i have to know the formula for ethylene glycol?
AP Chem - Temisan, Sunday, October 5, 2008 at 6:32pm
check it online. and balance the equation
AP Chem - DrBob222, Sunday, October 5, 2008 at 8:28pm
mass percent C = (mass C/mass sample)*100 =
Mass percent H = (mass H/mass sample)*100 =
Mass percent O = 100 -%C -%H.

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