Van Der Waals constant "a" depends on the intermolecular forces among gas molecules. Comparing the following gases, which one will have the highest value for "a"?
Answer: CH₄
Explanation
The Van der Waals constant "a" represents the magnitude of intermolecular attractions.
A higher "a" value means stronger intermolecular forces.
- He and H₂ are very light, nonpolar, and have weak intermolecular forces.
- N₂ is also nonpolar but heavier than He and H₂.
- CH₄ (Methane) is nonpolar but larger and more polarizable, so it has stronger London dispersion forces.
→ Therefore, CH₄ has the highest "a" value among the given options.
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