Which substance would you most likely need to cool to the lowest temperature before it condenses?

A substance must be cooled below its condensation point for its particles to form a liquid. Ethane is nonpolar and has only weak London dispersion forces, so it has the lowest boiling point of these choices and must be cooled the most to condense. Ammonia has stronger intermolecular attractions from its polarity and hydrogen bonding, while potassium bromide has strong ionic attractions.

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