Bond Enthalpies in the Gas Phase

Moderators: Chem_Mod, Chem_Admin

Tam To 1B
Posts: 72
Joined: Fri Sep 28, 2018 12:25 am

Bond Enthalpies in the Gas Phase

Postby Tam To 1B » Sun Mar 10, 2019 10:48 pm

When calculating enthalpy using bond enthalpies, do the calculations apply only for gaseous substances? If so, how do you know when to add or subtract the enthalpy of vaporization to change a liquid reactant or product?

Posts: 18901
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 734 times

Re: Bond Enthalpies in the Gas Phase

Postby Chem_Mod » Mon Mar 11, 2019 1:45 pm

Calculating the enthalpy of a reaction using average bond enthalpies is already an approximation, so it usually doesn't matter as long as the reactant and product are both in the same phase.

Return to “Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)”

Who is online

Users browsing this forum: No registered users and 3 guests