The reaction
2N2O5(g)→4NO2(g)+O2(g)
follows first order kinetics. The pressure of a vessel containing only N2O5 was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant) : [JEE MAINS - ONLINE - 2015]
(1) 106.25 mm Hg
(2) 116.25 mm Hg
(3) 125 mm Hg
(4) 150 mm Hg