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Dinitrogen pentoxide decomposes in the gas phase to form nitrogen
dioxide and oxygen gas. The reaction is first order in
pentoxide and has a half-life of 2.81 h at 25 °C. If a 1.5-L
reaction vessel initially contains 745 torr of N2O5 at 25 °C, what
partial pressure of O2 is present in the vessel after 215 minutes?