1.)Determine the rate constant from the concentration-time dependence:

Time (s)	[Reactant](M)
0.0	0.0350
10	0.0223
20	0.0142
50	0.0037
70	0.0015

Use SI units, that is, seconds for time (not included in answer).

Answer:

2.)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?

Calculate the instantaneous rate of formation of ethylene at 21.0 s (units mol/L/s).