If One Starts with Pure NO₂(g)at a Pressure of 0

If one starts with pure NO₂(g) at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2NO₂(g) 2NO(g) + O₂(g) reaches equilibrium is 0.674 atm. Calculate the equilibrium partial pressure of NO₂.

A) 0.152 atm
B) 0.174 atm
C) 0.200 atm
D) 0.326 atm
E) The total pressure cannot be calculated because K_p is not given