If all the following liquids are at the same temperature, then the liquid having the least vapor pressure will be:
- Butane (C₄H₁₀)
- Pentane (C₅H₁₂)
- Hexane (C₆H₁₄)
- Heptane (C₇H₁₄)
Explanation
Among the listed liquids, heptane (C₇H₁₄) has the greatest molecular weight
Thus the strongest intermolecular forces, lead to the lowest vapor pressure at the same temperature
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