part a$.$ Calculate the instantaneous rate of reaction at $41$ s $($units mol$/$L$/$s$).$

part b$.$ Calculate the instantaneous rate of formation of ethylene at $11\mathrm{.}0$ s $($units mol$/$L$/$s$).($It is a good idea to print the page in order to draw an accurate tangent line.$)$Cyclobutane can decompose to form ethylene: $C_4{H}_8(g)2C_2{H}_4(g).$ 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?