Cyclobutane, C4H8, consisting of molecules in which four carbon atoms form a ring, decomposes, when heated, to give ethylene.
C4H8(g) → 2C2H4(g)
The reaction is first order. In an experiment, the initial concentration of cyclobutane was 0.00105M. After heating at 450°C for 455 s, this was reduced to 0.00083 M. What was the concentration of cyclobutane after a total of 799 s?