Two students measure the vapor pressure of the same unknown organic liquid and compare results. The first student measured a vapor pressure of 626.3 torr at 177 °C, while the second student measured a vapor pressure of 0.5580 atm at 158 °C. What is the ΔH°vap, in kilojoules per mole, for this substance?

Chemistry & Chemical Reactivity
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ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter11: Intermolecular Forces And Liquids
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Two students measure the vapor pressure of the same unknown organic liquid and compare results. The first student measured a vapor pressure of 626.3 torr at 177 °C, while the second student measured a vapor pressure of 0.5580 atm at 158 °C. What is the ΔH°vap, in kilojoules per mole, for this substance?

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I'm just wondering where the 2.303 comes from? Thank you!

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