Units for enthalpy

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Hannah Lee 2F
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Joined: Thu Jul 11, 2019 12:15 am

Units for enthalpy

Postby Hannah Lee 2F » Mon Jan 27, 2020 12:45 pm

Are the enthalpy of reaction units kJ or kJ/mol? I thought that because change in enthalpy of rxn = q, the units would be written in kJ. However, the solutions manual writes enthalpy of reaction as kJ/mol when using bond enthalpies to calculate it.

Christineg1G
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Re: Units for enthalpy

Postby Christineg1G » Mon Jan 27, 2020 1:54 pm

For the standard enthalpy of reaction, the units would be kJ/mol.

Brittney Hun 2C
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Joined: Wed Sep 11, 2019 12:15 am

Re: Units for enthalpy

Postby Brittney Hun 2C » Mon Jan 27, 2020 5:15 pm

qp(work at a constant temperature) does equal enthalpy. The units for a standard reaction enthalpy is kj/mol. q is typically just j or kj but i belive in order to get that you would just multiply by the number of moles in the system, but they are essentially the same value. Enthalpy, without being a standard just has units of joules.

nicole-2B
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Re: Units for enthalpy

Postby nicole-2B » Mon Jan 27, 2020 9:22 pm

thanks for clarifying I was also confused about this


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