Enthalpy of vaporization

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Sabrina 1F
Posts: 7
Joined: Wed Nov 16, 2016 3:03 am

Enthalpy of vaporization

Postby Sabrina 1F » Fri Jan 12, 2018 2:59 pm

∆HVap= H_m (vapor)−H_m (liquid)
Would someone mind explaining each individual H of the formula? Also what do the little m's mean? (I got the equation from the book)

Thank you!

Thuy-Anh Bui 1I
Posts: 56
Joined: Sat Jul 22, 2017 2:00 am
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Re: Enthalpy of vaporization

Postby Thuy-Anh Bui 1I » Fri Jan 12, 2018 3:13 pm

Enthalpy of vaporization (ΔHvap) is the difference in molar enthalpy (Hm) between the vapor and liquid states. All the "H"s mean enthalpy. The "Δ" in ΔHvap shows the change in enthalpy of the vapor and liquid states. The "m" in Hm indicates that we are using molar enthalpy. Hope this helps!

Leah Thomas 2E
Posts: 51
Joined: Fri Sep 29, 2017 6:06 am

Re: Enthalpy of vaporization

Postby Leah Thomas 2E » Fri Jan 12, 2018 7:00 pm

Also, ΔH of vaporization is the change of enthalpy so to explain the equation you have to take the enthalpy of vapor subtracted from the enthalpy of liquid because it references again final-initial. In this case, vapor is the final product.

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