The rate constant for the first-order decomposition of cyclobutane at 500 °C is 9.2 x 10−3 s−1. How long will it take (in seconds) for 80.0% of a sample of C4H8 to decompose?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6