An unknown compound contains only C, H, and O. If the combustion of 6.50g of this compound produced 15.9g CO₂ and 6.50g H₂O, what is the empirical formula of the compound?
a) CH₂O
b) C₂H₄O₂
c) C₃H₆O₃
d) C₄H₈O₄