Answer
Starting with only A:
Some quantity of B must be produced, consuming A, in order to reach equilibrium.
Starting with only B:
Some quantity of A must be produced, consuming B, in order to reach equilibrium.
Starting with a mixture of A and B:
It depends. Maybe the some A must be produced, or maybe some B must be produced in order to reach equilibrium.
Work Step by Step
The equilibrium is reached when the rate of both forward and reverse reaction are the same.
