Problem: Calculate the change in entropy that occurs in the system when 30.5 g of acetone (C3H6O) vaporizes from a liquid to a gas at its normal boiling point (56.1 ˚C).

FREE Expert Solution

S=HT

ΔS = entropy, J/mol•K
ΔH = enthalpy, J
T = temperature, K


Svap=HvapTb


ΔHvap of acetone = 31.3 kJ/mol    →  convert from kJ to J: 1 kJ = 103 J
    ***can be found in books or online


Tb = 56.1°C + 273.15 = 329.25 K


Calculate ΔSvap:

Svap=31.3kJmol×103 J1 kJ329.25 KSvap=31300Jmol329.25 K

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Problem Details

Calculate the change in entropy that occurs in the system when 30.5 g of acetone (C3H6O) vaporizes from a liquid to a gas at its normal boiling point (56.1 ˚C).

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