[jmg12]

1) The radioactive isotope 64Cu is used in the form of copper (II) acetate to study Wilson's disease. The isotope has a half-life of 12.70 h. What fraction of radioactive copper (II) acetate remains after 64 h?

2) CH3N==NCH3 (g) --> N2 (g) + C2H6 (g) . The rate constant for this reaction at 600 K is 0.0216 min -1. If the initial quantity of azomethane in the flask is 2.00 g, how much remains after 0.0500 min? What quantity of N2 is formed in this time?

Any help of either would be great. I just don't know appropriate steps. Thanks so much.