Question: the empirical formula of a certain hydrocarbon is ch2?
Answer: The empirical formula of a certain hydrocarbon is CH2. When 0.125 moles of this hydrocarbon are completely combusted with excess oxygen, it is observed that 11.2 L of H2O gas is produced at STP. ... The ratio (0.500 / 0.125) = 4, and this is how many "H2" units are present in the hydrocarbon.