Vaporization and Condensation

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Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

Vaporization and Condensation

Postby Letty Liu 2C » Sat Feb 08, 2020 6:51 pm

When calculating enthalpy of equations, how do we know which enthalpy of vaporizations to subtract or add? Are vaporized molecules always added and condensed ones subtracted, or is it related to the side of the equation it’s on?

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: Vaporization and Condensation

Postby Ying Yan 1F » Sun Feb 09, 2020 12:49 pm

Enthalpy is vaporization should be addition because bonds are being broken, and energy needed to break bonds. On the other hand, during condensation, intermolecular bonds are being formed, therefore, energy is being released and it is a subtracted. I hope this helps!

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