The recombination of iodine atoms to form molecular iodine in the gas phase follows second order kinetics and has a rate constant of 7.0 x 109 M-1s-1 at 23 °C. I(g) + I(g) → I2(g) A. Assuming the initial concentration of I (g) was 0.086 M, calculate the concentration of I (g) after 2.0 min. B. What would the half-life be if the initial concentration of I (g) was 0.42 M?