Three liquid samples with known masses are heated to their boiling points with the use of a heater rated at 500. W. Once their boiling points are reached, heating continues for 4.0 min and some of each sample is vaporized. After 4.0 min, the samples are cooled and the masses of the remaining liquids are determined.

The process is performed at constant pressure.

(a) Using the following data, calculate ΔS_vap and ΔH_vap for each sample. Assume that all the heat from the heater goes into the sample.

(b) What do the values of ΔS_vap indicate about the relative degree of order in the liquids?

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Liquid C₂H5OH C4H10 CH3OH Boiling temperature/°C 78.3 0.0 64.5 Initial mass/g 400.15 398.05 395.15 Final mass/g 271.15 74.95 294.25