1) Identify whether entropy increases, decreases, or remains unchanged during ea

Question

1) Identify whether entropy increases, decreases, or remains unchanged during each of the following processes. a) Freezing liquid water b) Dissolving sodium chloride crystals into liquid water c) Expanding argon gas isothermally from 2 bar to 1 bar d) Chilling a steel ball bearing from 100 C to 25 oC e) Crystallizing a protein from an aqueous solution _- f) Heat shrink tubing shrinks (2) For each of the following processes predict qualitatively the sign for the change in entropy a) 12(g)-12(s) b) N2(8)-N20) c) CH30H(8) 3/2 02(8)CO2(2 H200) d) 2 SO3()2 02(8) 2 SO(g) (3) The complete combustion of 1-butanol, for which the data below for standard molar entropies at 298.15 K are available: (Gn J/mol-K) 225.7 Determine Asn (in I/mol-K) for this reaction. 205.2 213.8 70.0

Explanation / Answer

Ans 1 :

entropy is the degree of randomness or disorderness of the system . So when the solid transforms into liquid and gas its entropy increases and when liquid or gas solidifies or condenses , its entropy decreases.

So here :

a) decreases

b) increases

c) decreases

d) unchanged

e) decreases

f) decreases

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