Which isotope is lighter and tends to evaporate more readily?

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Multiple Choice

Which isotope is lighter and tends to evaporate more readily?

Explanation:
Lighter isotopes move faster at the same temperature, so they have higher average kinetic energy per molecule and higher vapor pressure. In evaporation, molecules from the liquid surface escape into the gas phase more readily when they’re moving faster and require less energy to overcome intermolecular forces. Among the listed isotopes, the lightest one is oxygen-16, so it tends to evaporate more readily than the heavier isotopes (oxygen-17, oxygen-18, and the heavier, less stable oxygen-20).

Lighter isotopes move faster at the same temperature, so they have higher average kinetic energy per molecule and higher vapor pressure. In evaporation, molecules from the liquid surface escape into the gas phase more readily when they’re moving faster and require less energy to overcome intermolecular forces. Among the listed isotopes, the lightest one is oxygen-16, so it tends to evaporate more readily than the heavier isotopes (oxygen-17, oxygen-18, and the heavier, less stable oxygen-20).

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