Which of the following gases is more ideal at STP?
Correct answer: C. H2
- A. SO2
- B. NH3
- C. H2
- D. H2S
Explanation
In order to understand the answer to this question, we first need to address the definition of an ideal gas:Hydrogen is the closest to ideal gases because it has the least amount of excluded volume (thereby bringing its molar volume close to that of an ideal gas), and the weakest intermolecular attractions. (Refer to bullet points 1 and 2 above)Bear in mind that the smaller the atomic number, the weaker the London dispersion forces, and by extension the intermolecular interactions.H2 has the smallest molecular mass amongst the options given.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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