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Answer:
b. 0.8 M
Explanation:
Based on the reaction, Keq is defined as:
Keq = 4.0 = [P2X] / [X]
As P is a pure solid, its concentration is not taken into account
The initial concentration of X is 1.0mol/L = 1M, the equilibrium concentrations are:
[X] = 1M - X
[P2X] = X
Where X is the reaction coordinate
Replacing:
4.0 = X / 1-X
4.0 - 4.0X = X
4.0 = 5.0X
0.8M = X = [P2X]
Right answer is: