9. A first-order reaction is 30% complete at the
end of 50 minutes.
Calculate the rate constant in sec$^{-1}$.
After how much time will 90% of the reaction be
complete?
10. The decomposition of an ideal gas follows $\frac{3}{4}$
-order kinetics.
The initial pressure was 1 atm, and after half an
hour, 50% decomposition has occurred.
Calculate the rate constant for this reaction.