At ?45?^°C, dinitrogen pentoxide (N2O5) decomposes into nitrous dioxide (NO2) and oxygen (O2) according to the law of uninhibited decay. An initial amount of 0.25M of dinitrogen pentoxide decomposes to 0.15 M in 17 minutes. How much dinitrogen pentoxide will remain after 30 minutes? How long will it take until 0.01 M of dinitrogen pentoxide remains?