The reaction x (g) + y (g) is reversible to 2Z (g) in a closed container. The known initial concentrations of X, y and Z are 0.1mol/l, 0.3mol/l and 0.2mol/l respectively. When the reaction reaches equilibrium under certain conditions, the concentration of each substance may be zero A. 34 mol / L B. 354mol / L C. 24 mol / L D. 4 mol / L What is the answer? Why? What should we do to solve the problem of possible concentration

The reaction x (g) + y (g) is reversible to 2Z (g) in a closed container. The known initial concentrations of X, y and Z are 0.1mol/l, 0.3mol/l and 0.2mol/l respectively. When the reaction reaches equilibrium under certain conditions, the concentration of each substance may be zero A. 34 mol / L B. 354mol / L C. 24 mol / L D. 4 mol / L What is the answer? Why? What should we do to solve the problem of possible concentration

The answer is a B
In this kind of problem, you can calculate the concentration of each substance after the reaction is completely carried out in both positive and negative directions, but it is impossible to completely react, so it is correct between the two values you calculated, which is the same as what you calculated, and it also seems wrong

A sign of chemical equilibrium?

In this way, we can directly or indirectly derive the following six judgment methods: (1) from the perspective of rate: the formation rate of the same substance is equal to the consumption rate; (2) from the perspective of rate