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 elementsc. 2HF(g) → H2(g) + F2(l)d. potassium iodide dissolves in pure water

FREE Expert 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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Problem Details

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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.

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Based on our data, we think this problem is relevant for Professor Van Der Sluys' class at PSU.