1. Write the reaction for the evaporation of water in a hot, dry room. Is this r
ID: 637932 • Letter: 1
Question
1. Write the reaction for the evaporation of water in a hot, dry room. Is this reaction spontaneous not? What are the signs of ??,ys and as,ys? 2. Acetic acid, CH3COOH, freezes at 16.6°C and has ??:us-69.0 J/g. Note: fus stands for fusion, wh the change from solid to liquid (melting) a) What is AH (in J/g) for acetic acid freezing? b) what is AH (in J/mol) for acetic acid freezing? c) What is ASuniv at the normal freezing point? d) What is ?Ssur in J K-1 mol 1 for acetic acid freezing at the normal freezing point? e) What is AS,y, in J K1 mol for acetic acid freezing at the normal freezing point?Explanation / Answer
Ans 1
Reaction for the evaporation of water
H2O(l)?H2O(g)
Standard free energy for the water vapor
?G = 8.43 kJ/mol
?G > 0
The reaction is non spontaneous.
Since the reaction goes from liquid phase to vapor phase, heat is absorbed during the process.
?H > 0
from liquid phase to vapor phase, disorder of the system increases.
?S > 0
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