The equilibrium constant for the reaction 2HBr(g) ⇌  H2(g) + Br2(g) is a 10 at a certain temperature, when concentrations are exprssed in moles per liter. Calculate the number of moles of HBr(g), present at equilibruim if 100L of the equiliburim mixture contaon 5 mol of H2(g) and 8mol of Br2(g).  The answer is 2

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