Prior to their phaseout in the 1980s, chemicals containing lead were commonly added to gasoline as anti-knocking agents. a 2.475 g sample of one such additive containing only lead, carbon, and hydrogen was burned in an oxygen rich environment. the products of the combustion were 2.694 g of co2(g) and 1.378 g of h2o(g). insert subscripts below to appropriately display the empirical formula of the gasoline additive: