Br2(l) --> 2Br(g)

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Amy Kumar 1I
Posts: 114
Joined: Thu Jul 11, 2019 12:15 am

Br2(l) --> 2Br(g)

Postby Amy Kumar 1I » Sun Jan 26, 2020 12:21 pm

For the reaction Br2(l) --> 2Br(g), how do you know which phase change enthalpies to use (why is it delta h vap + delta h bond)?

JonathanS 1H
Posts: 101
Joined: Thu Jul 11, 2019 12:17 am

Re: Br2(l) --> 2Br(g)

Postby JonathanS 1H » Sun Jan 26, 2020 12:36 pm

We know to use the phase change from a liquid to gas, Hvap because that is what is demonstrated in the equation. We then use the H for breaking bonds because the Br2 becomes 2Br.

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: Br2(l) --> 2Br(g)

Postby Tyler Angtuaco 1G » Sun Jan 26, 2020 12:41 pm

You use the heat/enthalpy of vaporization since the reactant is being vaporized into gas. You use bond enthalpy since the bond in the diatomic molecule Br2 breaks, forming two bromine atoms in the reaction.

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