Using the data for the benzene (1) + 2-propanol (2) system in Table 9-3, fit the experimental data to an appropriate polynomial equation whose independent variable is the mole fraction of ethanol. Work with only the 298.15 K data set.

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TABLE 9-3 Molar enthalpy of mixing for the benzene (1) + 2-propanol (2) system at 298.15 K and 308.15 K. T = 298.15 K ΔΗ[J/mol] 0 232.2 518.8 789.9 986.2 1110.4 1186.6 1234.3 1281.1 1319.2 1328.4 1287.4 1201.6 1071.1 906.3 687.4 418.4 161.1 0 0 X₁ 0.0632 0.1451 0.2346 0.3129 0.3734 0.4192 0.4509 0.4933 0.5511 0.6180 0.6941 0.7614 0.8222 0.8773 0.9290 0.9669 0.9889 1 T = 308.15 K AH[J/mol] 0 92.2 284.5 511.4 735.8 925.2 1100.5 1225.4 1319.5 1408.0 1454.9 1473.4 1431.3 1294.3 1064.0 766.5 436.8 153.8 0 0 X₁ 0.0213 0.0668 0.1237 0.1856 0.2440 0.3069 0.3606 0.4099 0.4790 0.5349 0.6036 0.6869 0.7788 0.8615 0.9245 0.9664 0.9893 1