Is there a significance with 298 degrees Kelvin?

Moderators: Chem_Mod, Chem_Admin

Nathan Tran 4K
Posts: 92
Joined: Fri Sep 28, 2018 12:16 am

Is there a significance with 298 degrees Kelvin?

Postby Nathan Tran 4K » Sat Feb 09, 2019 6:44 pm

In 8.49 of the 6th edition, we're asked to find the change in internal energy, knowing the reactions' change in enthalpy, and given the change in moles. We're not given a temperature, but we need a temperature to solve for work, or -p times delta V. We can solve for this using the ideal gas law. The temperature in the solutions manual is 298 degrees kelvin. Is this some kind of standard temperature for reactions? How was this number derived?

Bijan Mehdizadeh 1B
Posts: 73
Joined: Fri Sep 28, 2018 12:15 am

Re: Is there a significance with 298 degrees Kelvin?

Postby Bijan Mehdizadeh 1B » Sat Feb 09, 2019 7:42 pm

At standard conditions, temperature is 25 degrees Celsius or 298 K, so I would see if the question specifies that it takes place under standard conditions, because then you can assume the temperature to be 298 K. Pressure would be 1 atm and n would be 1 mol at standard conditions as well, so I would assume those if values are not given as well.

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Is there a significance with 298 degrees Kelvin?

Postby Cameron_Greenberg_3C » Sat Feb 16, 2019 9:16 pm

298 K is the standard temperature in an ideal gas equation and it is derived from 25 C + the conversion factor of 273. 298 seems like a random number but is in fact the Kelvin value in standard conditions.

Shibhon_Shepard
Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

Re: Is there a significance with 298 degrees Kelvin?

Postby Shibhon_Shepard » Wed Feb 20, 2019 1:36 pm

Yes, 298 Degrees Kelvin is the standard for ideal gas.

Celio_G_Dis2C
Posts: 33
Joined: Fri Jan 11, 2019 12:16 am

Re: Is there a significance with 298 degrees Kelvin?

Postby Celio_G_Dis2C » Thu Feb 21, 2019 1:56 am

It's part of the standard conditions of an ideal gas just as 1 atm is the condition for pressure

CHEM 14B Lover
Posts: 33
Joined: Fri Sep 28, 2018 12:19 am

Re: Is there a significance with 298 degrees Kelvin?

Postby CHEM 14B Lover » Thu Mar 14, 2019 2:32 pm

Standard conditions temp in kelvin! Because 25 C + 273


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

Who is online

Users browsing this forum: No registered users and 1 guest