Consider the equilibrium system below. NH sub 4 Cl cap s long left right arrow NH sub 4 Cl g If the system is at dynamic equilibrium, which statement is true?

At dynamic equilibrium, the forward and reverse processes continue, but occur at equal rates. Here, NH₄Cl crystals sublime into vapor while NH₄Cl vapor solidifies back into crystals. Therefore, the rate of sublimation equals the rate of solidification, so choice A is true.

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