Question

Select the reactions for which we should expect a delta S (entropy) to be >0. Can...

Select the reactions for which we should expect a delta S (entropy) to be >0. Can select more than one.

CO2 (g) + 2H2 (g)-->CH3OH (l)

2SO2 (g) + O2 (g)--> 2SO3 (g)

Ba(OH)2 (s)-->BaO (s)+ H2O (g)

FeCl2 (s) + H2(g)-->Fe (s)+2HCl (g)

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Answer #1

Hi,

Entropy measures the disorder of a system.

IfSsys > 0, the system becomes more disordered through the course of the reaction

IfSsys < 0, the system becomes less disordered (or more ordered) through the course of the reaction.

There are a few basic principles that should be remembered to help determine whether a system is increasing or decreasing in entropy.

  • Liquids are more disordered than solids.
    • WHY? - Solids have a more regular structure than liquids.
  • Gases are more disordered than their respective liquids.
    • WHY? - Gases particles are in a state of constant random motion.
  • Any process in which the number of particles in the system increases consequently results in an increase in disorder.

For the above question following two reactions, the entropy S would be greater than zero

Ba(OH)2 (s)-->BaO (s)+ H2O (g)

FeCl2 (s) + H2(g)-->Fe (s)+2HCl (g)

Hope this solves your problem

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