3 moles of pure water are adiabatically mixed with 1 mole of pure ethanol at a constant pressure of 1 bar. The initial temperatures are the pure components are equal. If the fi nal temperature is measured to be 311.5 K, determine the initial temperature. The enthalpy of mixing between water (1) and ethanol (2) has been reported to be fi t by:

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Ahmix R =x[-190.0+ = 214.7(x-x) 419.4(x-x) + 383.3(x - x) - 235.4(x-x1)4] [K]