EXCESS-ENTHALPIES OF BINARY-MIXTURES CONTAINING EITHER METHYLCYCLOPENTANE OR METHYLCYCLOHEXANE

A flow microcalorimeter of the Picker design was used to measure excess molar enthalpies H(E) at 298.15 K, as a function of mole fraction, of the mixtures methylcyclopentane (C-C5H9CH3) + cyclopentane (c-C5H10), and + methylcyclohexane (c-C6H11CH3), and of methylcyclohexane + n-heptane (n-C7H16), + n-decane (n-C10H22), + cyclopentane, + benzene (C6H6), and + tetrachloromethane (CCl4). The calorimeter was equipped with separators and operated in the discontinuous mode. The H(E)s of the first-named three systems are negative, those of the remaining four are all positive. At equimolar composition, H(E)(x1 = 0.5)/J.mol-1 ranges from -113 for (c-C5H9CH3 + c-C5H10) to + 792 for (c-C6H11CH3 + C6H6).