Water’s boiling point changes with differing external pressure. At 1 atm, the boiling point of water is 100 °C. When a vacuum is applied to water and the external pressure decreases to 0.023 atm, water boils at room temperature (20 °C). Using this information, calculate the enthalpy of vaporization for water in kJ/mol with 2 significant figures.

Hint: Use units of Kelvin for temperature!

Group of answer choices

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43

11