For the equilibrium reaction 2NO(g) + O2(g) ⇌ 2NO2(g), what effect does adding more O2 have?

A. Equilibrium shifts left
B. Equilibrium shifts right
C. No effect
D. Increases the K value

Answer: Equilibrium shifts right


Additional Information: Adding O2 increases its concentration, shifting the equilibrium to favor NO2 production.