Problem: Predict which substance has greater molar entropy. Explain.(a) NO2(g) or N2O4(g)(b) CH3OCH3(l) or CH3CH2OH(l)(c) HCl(g) or HBr(g)

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FREE Expert Solution

We’re being asked to Predict which substance has greater molar entropy.


Recall that entropy is the degree of chaos or disorder of a system and that it depends on the following:


1. Phase: The gas phase has the highest entropy, followed by the liquid, and then the solid phase with the lowest entropy.

Gas > Liquid > Solid


2. Complexity: More elements in the compound leads to higher entropy.

Ex. NO3(g) [4 elements] has higher entropy than NO2(g) [3 elements].


3. Mass: The greater the mass, then the greater the entropy.

Ex. Xe(g) [greater mass] has higher entropy than He(g).



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Problem Details

Predict which substance has greater molar entropy. Explain.

(a) NO2(g) or N2O4(g)

(b) CH3OCH3(l) or CH3CH2OH(l)

(c) HCl(g) or HBr(g)