please help!!

The breakdown of a certain pollutant X in sunlight is known to follow first-order kinetics. An atmospheric scientist studying the process fills a 45.0 L reaction task with a sample of urban air and finds that the partial pressure of X in the flask decreases from 0.805 atm to 0.599 atm over 5.2 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 2 significant digits atm D 5 5