Physical Chemistry II. Chemical Kinetics. Please help with hw #1-3 with clear explanation. Thank you

1. For a second-order reaction, what is the unit of the rate of the reaction? (5 pts) 2. What is a correct expression of the rate of the following reaction? (5 pts). C2H4(g)+O3(g)C2H4O(g)+O2(g)t[C2H4]t[C2H4O]3t[O3]t[O2] 3. Calculate the average rate (and unit) based on the table given and the equation below (5pts) C2H4+O3C2H4O+O2