assuming temperature

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Savannah Mance 4G
Posts: 107
Joined: Fri Aug 30, 2019 12:17 am

assuming temperature

Postby Savannah Mance 4G » Tue Feb 04, 2020 10:51 pm

Do we always assume the temperature is 298 K when we have to use the equation (change in enthalpy) = (change in internal energy) + (change in moles) RT? And if so why?

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

Re: assuming temperature

Postby Rida Ismail 2E » Tue Feb 04, 2020 10:56 pm

Usually it will state the temperature. If not there should be some indication that the system is at STPbin that case you can assume 25 degrees Celsius. STP basically means standard temp and pressure and standard pressure is roughly 298K.

IScarvie 1E
Posts: 66
Joined: Sat Aug 17, 2019 12:16 am

Re: assuming temperature

Postby IScarvie 1E » Wed Feb 05, 2020 6:25 pm

If delta H is noted to be at STP, then you can assume it is at 25 degrees C. If not, the temperature should be stated

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