Chemistry Practice Problems Entropy Practice Problems Solution: Which of the following processes have a ΔS > 0?...

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Solution: Which of the following processes have a ΔS > 0?a. 2NH3(g) + CO2(g) → NH2CONH2(aq) + H2O(l)b. lithium fluoride forms from its elementsc. 2HF(g) → H2(g) + F2(l)d. potassium iodide dissolves in pure water

Problem

Which of the following processes have a ΔS > 0?

a. 2NH3(g) + CO2(g) → NH2CONH2(aq) + H2O(l)

b. lithium fluoride forms from its elements

c. 2HF(g) → H2(g) + F2(l)

d. potassium iodide dissolves in pure water

Solution

We’re asked to determine which of the following processes have a ΔS > 0.


Also, recall that if: 

• ΔS > 0 or ΔS = (+); entropy is increased

• ΔS < 0 or ΔS = (–); entropy is decreased


Remember that phase changes lead to a change in entropy:



Also, recall that:


  • An increase in the number of gas molecules in the reaction also leads to an increase in entropy.
  • If bonds are broken then the entropy of a reaction increases,
  • But, if bonds are formed then the entropy of a reaction decreases.


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