Atanker truck has tipped over and spilled a pulse of gasoline into a stream that enters a pond. the surface film of pure hydrocarbons has evaporated but gasoline constituents are still dissolved in the pond water. the pond is stratified, because it is summer, and the well- mixed epilimni constituents: hexane (cshi4) and nonane (ch20). both are initially present in solution at 200 ppb. for this problem, assume volatilization to the air is the only loss mechanism. on layer containing the gasoline is 2.0 m deep. consider the fate of two fuel plot the predicted declining concentration of hexane versus time if the piston velocity measured for propane (c3h,) is 3.0 x105ms1. use a 1st-ordergas- exchange coefficient approach (see section 2.3.3 in the reading.) a. b. on the same axis, plot the concentration of nonane over time. c. in general, how does the composition of the dissolved gasoline constituents change over time? l. e, is "freshly spilled" gasoline the same mixture of hydrocarbons as "aged" dissolved gasoline?