The standard Gibbs energy of reaction for the equilibrium:
2NO₂(g) ⇄ N₂O₄(g)
is -4.73 kJ mol⁻¹ at 298 K. Calculate the value of the equilibrium constant at this temperature. R = 8.3145 J mol⁻¹ K⁻¹
A. 6.75
B. 81
C. 1.00
D. 0.15