Heat is enthalpy or Q?

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Emily Vainberg 1D
Posts: 102
Joined: Sat Jul 20, 2019 12:15 am

Heat is enthalpy or Q?

Postby Emily Vainberg 1D » Sun Feb 09, 2020 10:45 pm

"How much heat is required to convert a 42.30g block of ice at -5.042 degrees C into water vapor at 150.35 degrees C?"

How come for this problem the answers use delta H for the heat? I thought you would be using q since they did not specify that you were calculating the change in enthalpy??

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: Heat is enthalpy or Q?

Postby Niharika 1H » Sun Feb 09, 2020 10:54 pm

At a constant pressure, q and delta H are interchangeable.

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Joined: Wed Nov 14, 2018 12:23 am

Re: Heat is enthalpy or Q?

Postby kausalya_1k » Sun Feb 09, 2020 11:28 pm

in isobaric reactions (deltaP=0), enthalpy (deltaH)=heat (q)

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

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