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(I) A nonvolatile solute is dissolved in pentane and then the volume of this solvent is reduced from 200 mL to 50 mL by evaporation. What is the sign of the entropy change, ??delta??Ssys, for the nonvolatile solute during the evaporation?
a) ??delta??Ssolute < 0 because reducing the volume of solvent decreases the positional disorder of the solute.
b) ??delta?? Ssolute < 0 because reducing the volume of solvent increases the positional disorder of the solute.
c) ??delta?? Ssolute > 0 because reducing the volume of solvent decreases the positional disorder of the solute.
d) ??delta?? Ssolute > 0 because reducing the volume of solvent increases the positional disorder of the solute.
(II) The temperature of 2.00 mol Ne(g) is increased from 25 °C to 200 °C at constant pressure. Calculate the change in the entropy of neon (assume ideal behavior).
(III) Calculate the change in molar entropy when the pressure of argon is allowed to double isothermally (assume ideal behavior).
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