Entropy is a focus of Topic 10. Entropy is given the symbol \'S\'. The more mixe
ID: 500097 • Letter: E
Question
Entropy is a focus of Topic 10. Entropy is given the symbol 'S'. The more mixed up things are, the higher the entropy. The more ways for a things to be considered the same (how many ways can 3 pennies have 1 head and two tails), the higher the entropy. Entropy and disorder are closely related. As disorder increases, entropy increases. For example, consider your sock drawer. If all the socks are paired, the entropy is relatively low, but if the socks are all mixed up, the entropy is much higher. If there are many ways to arrange the particles in the system, then there is greater disorder. Systems with greater disorder have greater entropy. Let's try and solve some problems: Consider the following reactions. Use your intuition to complete the table below Lastly, use the table of thermodynamic functions to compute the Delta H degree and Delta S degree for the reactions in #1. Then using Delta H degree and Delta S degree and your knowledge of the second law. compute which reactions are spontaneous under standard conditions.Explanation / Answer
* Disorderness increases from solids to liquids to gases.
* More is the disorderness more is the entropy.
* Incease in entropy can have positive sign and decrease in entropy can have negative sign
(1)
(a) 2 H2 (g) + O2 (g) ----------> 2 H2O (l)
Disordeness - Decreases
Entropy - Decreases
Sign of deltaS = -ve
(b) CO2 (s) ---------> CO2 (g)
Disordeness - Increases
Entropy - Increases
Sign of deltaS = +ve
(c) K+ (aq.) + Br- (aq.) -------------> KBr (s)
Disordeness - Increases
Entropy - Increases
Sign of deltaS = +ve
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