The breakdown of a certain pollutant X in sunlight is known to follow first-order kinetics. An atmospheric scientist studying the process fills a 20.0-L reaction flask with a sample of urban air and finds that the partial pressure of in the flask decreases from 0.473 atm to 0.376 atm over 5.6 hours.
Calculate the initial rate of decomposition of X, that is, the rate at which X was disappearing at the start of the experiment. Round your answer to significant digits. Round your answer to 2 significant digits.