A sample of ammonia gas was allowed to come to equilibrium at 400 K. At equilibr

Question

A sample of ammonia gas was allowed to come to equilibrium at 400 K.

At equilibrium, it was found that the concentration of H2 was 0.0560 M, the concentration of N2 was 0.0187 M, and the concentration of NH3 was 0.395 M. What was the initial concentration of ammonia?

A sample of ammonia gas was allowed to come to equilibrium at 400 K. 2NH3(g) At equilibrium, it was found that the concentration of H2 was 0.0560 M, the concentration of N2 was 0.0187 M, and the concentration of NH3 was 0.395 M. What was the initial concentration of ammonia?

Explanation / Answer

2NH3 ------> N2 + 3H2

[NH3]             0         0    beggining

[NH3] - 2x      x        3x    equilibrium

[N2] equilibrium= 0.0187M= x ------> [NH3]beggining-2x =0.395M -----> [NH3]beggining= 0.395 + 2 x 0.0187= 0.4324M

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