Dinitrogen Tetroxide Partially Decomposes According to the Following Equilibrium: N₂O₄(g)⇌

Dinitrogen tetroxide partially decomposes according to the following equilibrium: N₂O₄(g) ⇌ 2 NO₂(g)
A 1) 000-L flask is charged with 3.00 × 10^-2 mol of N₂O₄.At equilibrium,2.36 × 10^-2 mol of N₂O₄ remains.K_eq for this reaction is ________.

A) 0.723
B) 0.391
C) 0.212
D) 6.94 ×
E) 1.92 × 10^-4