units for reaction enthalpy and enthalpy of formation

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Brian Tangsombatvisit 1C
Posts: 119
Joined: Sat Aug 17, 2019 12:15 am

units for reaction enthalpy and enthalpy of formation

Postby Brian Tangsombatvisit 1C » Sat Feb 01, 2020 12:44 pm

I've seen kJ and kJ/mol being used interchangeably for both reaction enthalpy and enthalpy of formation, so are either units okay? Or does enthalpy of formation typically have units of kJ/mol and does reaction enthalpy typically have units of just kJ?

Mariana Fuentes 1L
Posts: 43
Joined: Wed Nov 15, 2017 3:00 am

Re: units for reaction enthalpy and enthalpy of formation

Postby Mariana Fuentes 1L » Sat Feb 01, 2020 1:17 pm

I'm not too sure about my answer, but I believe that you can use them interchangeably.

Daniela Shatzki 2E
Posts: 53
Joined: Sat Aug 24, 2019 12:16 am

Re: units for reaction enthalpy and enthalpy of formation

Postby Daniela Shatzki 2E » Sat Feb 01, 2020 2:55 pm

I think you can use both. If it just says kJ it usually means per mole unless otherwise stated.

Abhi Vempati 2H
Posts: 104
Joined: Fri Aug 09, 2019 12:17 am

Re: units for reaction enthalpy and enthalpy of formation

Postby Abhi Vempati 2H » Mon Feb 03, 2020 10:28 am

You can use both interchangeably. According to my TA (Dane), the per mol part simply clarifies that we are calculating the energy absorbed/release if the entire reaction occurred 1 mol times. Hope this helps!


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