# Shift of Chemical equilibrium

Chemistry Level pending

At constant temperature and pressure, nitrogen (N$$_2$$) and oxygen (O$$_2$$) reach an equilibrium state as follows: $\text{N}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{NO}(g).$ If N$$_2$$ gas is added after the initial equilibrium and a new equilibrium state is reached, then the concentration of certain substance will increase compared to the initial equilibrium state. What is such substance?

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