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Consider the following equilibrium system in a sealed, rigid container:

$$N_2(g) + 3 H_2(g) ⇄ 2 NH_3(g) \quad ΔH = −92 \ \text{kJ}$$

Which of the following changes would NOT affect the value of $Q_p$?


Opening the sealed container to the surroundings.


Increasing the total pressure of the system by adding argon gas.


Placing the system in a flexible, sealed container, like a balloon.


Adding concentrated hydrochloric acid to the gaseous system.

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