Problem: For each of the following processes, indicate whether the signs of S and H are expected to be positive, negative, or about zero.A diatomic molecule dissociates into atoms.

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We’re being asked to determine the signs of S and H for the following process:


A diatomic molecule dissociates into atoms


Entropy(S) and enthalpy (H) are thermodynamic properties.

  • Entropy (S) is the degree of chaos or disorder of a system.
  • Enthalpy(H) is the heat absorbed or released by a system.


First, let’s determine the sign of H for the dissociation of diatomic molecules into atoms.


Recall that:

  • ΔH is negative when heat is released by a system to the surrounding.
  • ΔH is positive when heat is absorbed by the system from the surrounding.
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Problem Details

For each of the following processes, indicate whether the signs of S and H are expected to be positive, negative, or about zero.


A diatomic molecule dissociates into atoms.

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

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Lapeyrouse's class at UCF.