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A binary liquid mixture is in equilibrium with its vapor at a temperature T = 300 K. The liquid mole fraction x${_1}$ of species 1 is 0.4 and the molar excess Gibbs free energy is 200 J/mol. The value of the universal gas constant is 8.314 J/mol-K, and ${\gamma}{_1}$ denotes the liquid-phase activity coefficient of species i. If ln(${\gamma}{_1}$) = 0.09, then the value of ln(${\gamma}{_2}$), up to 2 digits after the decimal point, is $\_\_\_\_\_\_$
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