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Which of the following hydrogen halides has the highest entropy value?

Chemistry
JAMB 2004

Which of the following hydrogen halides has the highest entropy value?

  • A. HF
  • B. HCl
  • C. HBr
  • D. HI
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Correct Answer: Option D
Explanation

Entropy is a thermodynamic parameter that measures the disorder or randomness of a system. In general, gases with greater molecular weights have greater entropy. Thus, the entropy energies are in the order: 

  • HF 173.779 ± 0.003 J K-1mol-1 
  • HCl: 186.9 J K-1mol-1
  • HBr: 198.7 J K-1mol-1
  • HI: 206.6 J K-1mol-1 . Consequently, HI has the highest entropy value while HF has the least because the greater the molecular weights the greater the entropy value.

There is an explanation video available below.


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Explanation Video

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