Final answer:
The overall order of the reaction with the rate law 'rate = k[F₂][Cl₂O]' is 2, since the reaction is first order with respect to both F₂ and Cl₂O.
Step-by-step explanation:
The overall order of a reaction with the rate law rate = k[F₂][Cl₂O] is determined by adding the exponents of the concentration terms in the rate law equation. For this rate law, the order with respect to F₂ is 1 (since there is no exponent written, it is implicit), and the order with respect to Cl₂O is also 1. Therefore, to find the overall order of the reaction, we add the individual orders: 1 (F₂) + 1 (Cl₂O) = 2.