Cyclobutane can decompose to form ethylene: C4H8(g)2C2H4(g). The cyclobutane concentration can be measured as a function of time (shown below) by mass spectrometry. Which of the following is the rate of reaction? (Use figure for Q 3337 ) Calculate the instantaneous rate of reaction at 9.0s (units mol/L/s). (It is a good idea to print the page in order to draw an accurate tangent line.) Answer: Calculate the initial rate of reaction (units mol/L/s ). Answer: Calculate the instantaneous rate of formation of ethylene at 16.0s (units mol/L/s)