Rate constants for the reaction
NO2 (g) + CO (g) → NO (g) + CO2 (g)
are 1.3 M -1 s-1 at 700 K and 23.0 M -1 s-1 at 800 K.
a) What is the value of the activation energy in kJ/mol?
b) What is the rate constant at 730 K?
Express your answer using two significant figures.