The molecule pyrene can be excited with UV light, and the excited state (Pyr*)
can either fluoresce, decay to the ground state nonradiatively, or be quenched
with O2 in a second-order quenching reaction. Given that kobs, the observed first-
order decay constant of Pyr*, is given by
kobs = k1 + kQ[O2]
*The fluorescence quantum yield is 0.092. Calculate kf, knr, and kQ, the O2-Quenching
constant, from the following data