The decomposition of pure ozone (O3) into oxygen (O2) occurs according to the following equation. 2O3(g)3O2(g) The decomposition is a second order process with a rate constant of 0.835M1s1. If initially there was 0.963M of O3, how long (in seconds) would it take to reduce to a concentration of 0.393 M? Report answer to 3 significant figures. Question 20 2pts A radioisotope decays according to a first order reaction. The half-life of the radioisotope is 686 years. How many grams of the isotope would remain after 72.9 years, if there was 478 grams initially? Report answer to 3 significant figures