Consider the Following Reaction,equilibrium Concentrations,and Equilibrium Constant at a Particular

Multiple Choice

Consider the following reaction,equilibrium concentrations,and equilibrium constant at a particular temperature.Determine the equilibrium concentration of NO₂(g) .
N₂O₄(g) ⇌ 2 NO₂(g) K_c = 0.21
[N₂O₄]_eq = 0.039 M

A) 1.22 M
B) 9.0 × 10^-2 M
C) 7.8 × 10^-2 M
D) 8.2 × 10^-3 M
E) 11 M