Combustion of 135.0 mg of a hydrocarbon (compound containing only C and H) produces 440.0 mg CO₂ and 135.0 mg H₂O. The molar mass of the hydrocarbon is 270 g/mol. What are the empirical and molecular formulas of this compound?

(Please answer with the empirical formula first, followed by a comma and then the molecular formula. For example: if the empirical formula is CH and the molecular formula is C₂H₂, your answer should be CH, C2H2)