posted by Anna .
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?
make a mol fraction and then multiply by 100
but don't i have to know the formula for ethylene glycol?
check it online. and balance the equation
mass percent C = (mass C/mass sample)*100 =
Mass percent H = (mass H/mass sample)*100 =
Mass percent O = 100 -%C -%H.