Reaction Enthalpies, #7.51

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saialam 1A
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Joined: Fri Sep 26, 2014 2:02 pm

Reaction Enthalpies, #7.51

Postby saialam 1A » Mon Jan 19, 2015 4:52 pm

Do we assume that the temperature would be 25 degrees C if it is not given to us in the text. For example, in question 51 in chapter 7 they don't give us the temperature.

Niharika Reddy 1D
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Re: Reaction Enthalpies, #7.51

Postby Niharika Reddy 1D » Mon Jan 19, 2015 5:24 pm

Someone actually asked the same question a few questions down, but page 265 in the textbook says most thermochemical data are reported for 25° C, which is 298.15 K. It also says all reaction enthalpies used in the textbook are for 298.15 K unless otherwise indicated. So yes, that's what we assume.

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Re: Reaction Enthalpies, #7.51

Postby Chem_Mod » Mon Jan 19, 2015 10:28 pm

Yes, as stated above, for standard reaction enthalpies, the measurements are taken at standard temperature and pressure. Therefore, room temperature, or 25C
or 298.15 K, is the STP temperature to which we can assign the standard reaction enthalpy values.


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