Rank the following from lowest to highest entropy. a)Br2 (l), Br2 (g), I2 (g)(b) C4H8 (l), C4H10 (l), C4H6 (l) Predict the sign of ∆S for the following reactions. (a) H2O (s) → H2O (l) (b) NaCl (s) → NaCl (aq) (c) 3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g) (d) 4 Fe (s) + 3 O2(g) → 2 Fe2O3 (s) For each reaction below, predict whether the reaction will be always spontaneous, never spontaneous, or sometimes spontaneous depending on temperature. NOTE: We did not really practice this in lecture, but try and use the example of melting ice and its spontaneity as an example. Dispersing heat refers to enthalpy and dispersing matter refers to entropy. Give it a try! A reaction disperses heat and disperses matter A reaction disperses heat, but not matter A reaction requires heat, but disperses matter. A reaction requires heat and does not disperse matter.

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Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 10.39PAE: Through photosynthesis, plants build molecules of sugar containing several carbon atoms from carbon...

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Rank the following from lowest to highest entropy.

a)Br2 (l), Br2 (g), I2 (g)

(b) C4H8 (l), C4H10 (l), C4H6 (l)

Predict the sign of ∆S for the following reactions.
1. (a) H2O (s) → H2O (l)
2. (b) NaCl (s) → NaCl (aq)
3. (c) 3 NO2 (g) + H2O (l) → 2 HNO3 (aq) + NO (g)
4. (d) 4 Fe (s) + 3 O2(g) → 2 Fe2O3 (s)

For each reaction below, predict whether the reaction will be always spontaneous, never spontaneous, or sometimes spontaneous depending on temperature.

NOTE: We did not really practice this in lecture, but try and use the example of melting ice and its spontaneity as an example. Dispersing heat refers to enthalpy and dispersing matter refers to entropy.

Give it a try!

A reaction disperses heat and disperses matter
A reaction disperses heat, but not matter
A reaction requires heat, but disperses matter.
A reaction requires heat and does not disperse matter.

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