Dinitrogen pentoxide gas decomposes to form nitrogen dioxide and oxygen. The reaction is first-order and has a rate constant of 0.247 h–1 at 25°C. If a 2.50-L flask originally contains N2O5 at a pressure of 756 mm Hg at 25°C, then how many moles of O2 are formed after 135 minutes? (Hint: First write a balanced equation for the decomposition.)
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