Answer to Question #197733 in General Chemistry for Nicole

Question

The decomposition of Nitrogen dioxide to Nitric Oxide and oxygen is an example of second-order reaction. It has a rate constant of 0.54 M^-1s^-1 at 300°C. (a) If the initial concentration of NO2 is 0.00800 M, what is the concentration of NO2 after 20.0 minutes? (b) initial concentration of NO2 is 0.00800 M, what is the half life?

Answer 1

$: 2 N O _2 → 2 N O + O _2 .$

what is the concentration of NO2 after 20.0 minutes? $= 0.54×20.0×60= 648M$

Half life = $\frac{1}{2}×0.00800=0.00400$