Thermodynamics - Calculating K of reaction

[Bill Nye Tho]

Homework Statement

Establish K at 298K for the reaction:

2N₂O₄ (g) + O₂ (g) → 2N₂O₅ (g)

Homework Equations

ΔG° = -RTlnK

The Attempt at a Solution

I've established that ΔG° = 34.4 kJ/mol (Correct) but for some reason when I solve for:

K = e^ΔG°/-RT

K = e^{34.5/(-(8.314)(298))} = .98495

I get the wrong answer.

 

[Bill Nye Tho]

Ah, silly me... The units for my gas constant are in Joules not kJoules.

Got it.