Question

Ethanol (1) and n-hexane (2) form two liquid phases at many temperatures. You may assume that the activity coefficients for n-hexane - ethanol mixture can be represented by the following activity model: RT ln γ1 = 8163 x1x2 [J/mol] and the vapour saturations of the pure components are given by (P in bar and T in K) ln P1sat = (-4728.98/T) + 13.4643 ln P2sat = (-3570.58/T) + 10.4575 1. Calculate the upper consulate temperature for the the ethanol - mixture. (2 marks) 2. Find the liquid compositions of the two liquid phases in equilibrium at 450 K. (8 marks) 3. Determine the vapour composition in equilibrium at a system pressure of 1.013 bar. (5 marks)

Answer 1

• Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.