Cyclobutane, c h , consisting of molecules in which 48 four carbon atoms form a ring, decomposes, when heated, to give ethylene. the reaction is first order. in an experiment, the initial con- centration of cyclobutane was 0.00150 m. after heating at 450°c for 455 s, this was reduced to 0.00119 m. what was the concentration of cyclobutane after a total of 875 s?