The temperature-dependence of the vapor pressure of phosphoryl chloride difluoride (OPClF₂) has been measured:

(a) Plot ln P against 1/T (this plot is best created with the aid of a computer or a graphing calculator that can calculate a linear least squares fit to the data).

(b) From the plot (or a linear equation derived from it) in part (a), determine the standard enthalpy of vaporization of OPClF₂;

(c) the standard entropy of vaporization of OPClF₂; and

(d) the normal boiling point of OPClF₂.

(e) If the pressure of a sample of OPClF₂ is reduced to 15 Torr, at what temperature will the sample boil?

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Temperature, T/K Vapor pressure, P/Torr 190. 3.2 228 68 250. 240. 273 672