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6.26 The heat of mixing data for water (1) and tetrahydrofuran (2) mixtures at 298.15K are reported by Kiyohara and Benson (1977) as follows: (a) Plot Hmix versus x1 and determine H1H1 and H2H2 graphically at x1=0.5 (b) How much heat would be released (or absorbed) upon mixing 6 mol of water with 14 mol of tetrahydrofuran at a constant temperature of 298.15K. (Answer: (a) H1H1=1110J/mol,H2H2=705J/mol and (b)