Find the Keq for this reaction using ICE table?

Question

At a high temperature, 0.50 mol of HBr was placed in a 1.0 L container and allowed to decompose according to the reaction:

2HBr(g) ⇌ H2(g) + Br2(g)

At equilibrium the [Br2] was measured to be 0.13 M. What is Keq for this reaction at this temperature?

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Answer 1 · 2018-06-14T10:08:06

Consider,

#2HBr(g) rightleftharpoons H_2(g) + Br_2(g)#

and its ICE table,

puu.sh

where #x = 0.13"M"# (it's given in this problem, which makes it relatively trivial).

Hence,

#K_"eq" = ([Br_2][H_2])/([HBr]^2) = x^2/(0.5-2x)^2 approx 0.123#