Chemistry Help!!!!! Easy 10 points?

Anthraquinone contains only carbon, hydrogen, and oxygen. When 4.80 g is burned, 14.22 g of CO2 and 1.66 g H2O are produced. The vapor pressure of 1.5 moles of diethyl methyl amine at 66C is reduced from 14.7 psi to 13.8 psi by 20.8 g of anthraquinone. What is its molecular formula?