An equal number of moles of i2(g) and br2(g) are placed into a closed container and allowed to establish the following equilibrium:
i2(g) + br2(g) 2ibr(g)
keq = 280
which one of the following relates [ibr] to [i2] at equilibrium?
[i2] = [ibr]
[i2] < [ibr]
[i2] = 2 [ibr]
[i2] = 280 [ibr]

Answer : The correct option is,

Solution : Given,

Moles of = Moles of

The balanced equilibrium reaction is,

The expression for equilibrium constant is,

As per question, Moles of = Moles of

Now put all the given values in above formula, we get the relation between the and .

From this we conclude that the concentration of is greater than the concentration of .

Therefore, the correct option is,