Which of the following expressions is the correct equilibrium-constant expression for the reaction below? (NH4) 2Se (s) ![Which of the following expressions is the correct equilibrium-constant expression for the reaction below? (NH<sub>4</sub>) <sub>2</sub>Se (s) 2NH<sub>3</sub> (g) + H<sub>2</sub>Se (g) A) [NH<sub>3</sub>][H<sub>2</sub>Se] / [(NH<sub>4</sub>) <sub>2</sub>Se] B) [(NH<sub>4</sub>) <sub>2</sub>Se] / [NH<sub>3</sub>]<sup>2</sup>[H<sub>2</sub>Se] C) 1 / [(NH<sub>4</sub>) <sub>2</sub>Se] D) [NH<sub>3</sub>]<sup>2</sup>[H<sub>2</sub>Se] E) [NH<sub>3</sub>]<sup>2</sup>[H<sub>2</sub>Se] / [(NH<sub>4</sub>) <sub>2</sub>Se]](https://d2lvgg3v3hfg70.cloudfront.net/TB1822/11ea7ce9_fb24_5e12_b46a_9b48cf15e3dc_TB1822_11.jpg)
2NH3 (g) + H2Se (g)
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