At 25∘c, the decomposition of dinitrogen pentoxide, n2o5(g), into no2(g) and o2(g) follows first-order kinetics with k=3.4×10−5 s−1. a sample of n2o5 with an initial pressure of 760 torr decomposes at 25∘c until its partial pressure is 650 torr. how much time (in seconds) has elapsed? at 25, the decomposition of dinitrogen pentoxide, (g), into (g) and (g) follows first-order kinetics with . a sample of with an initial pressure of 760 decomposes at 25 until its partial pressure is 650 . how much time (in seconds) has elapsed? 5.3×10−6 2000 4600 34,000 190,000