For the reaction ,$N_2O_5(g)\iff 2NO_2(g)+0.5O_2(g)$.Calculate the mole fraction of $N_2O_5(g)$ decomposed at a constant volume and temperature,if the initial pressure at any time is 960mm Hg.Assume ideal gas behaviour.

Question

$(a)\;0.2\qquad(b)\;0.3\qquad(c)\;0.1\qquad(d)\;0.4$