Using the NIST Webbook, if one looks up the molar enthalpy of pure benzene at 308.15 K

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Using the NIST Webbook, if one looks up the molar enthalpy of pure benzene at 308.15 K and 1 bar, the reported value is –6359.6 J/mol. Figure 9-3 has this same property as being equal to 1356.9 J/mol (via Example 9-2). Whose value, if any, is in error? Please explain your answer. 

H(J/mol) 3500 3000 2500 2000 1500 1000 500 0 0 298.15 K 0.2 308.15 K 0.4 0.6 Mole fraction benzene FIGURE 9-3

TABLE 9-3 Molar enthalpy of mixing for the benzene (1) + 2-propanol (2) system at 298.15 K and 308.15 K. T =

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