The half-life of a unimolecular decomposition reaction is 3.1 hours at 298 K and 1.6 minutes at 700 K. Find the Arrhenius constants (Ea and A).

a) Define the Arrhenius equation.
b) Express the relationship between half-life and rate constant.
c) Calculate the activation energy (Ea).
d) Determine the pre-exponential factor (A).