Change in internal energy equation


Moderators: Chem_Mod, Chem_Admin

Amy Lefley 1J
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Change in internal energy equation

Postby Amy Lefley 1J » Thu Jan 31, 2019 10:33 pm

When calculating the change in internal energy of a system, I know you can use the equation q=C*deltaT. Why is mass or moles not included in this equation? Are there other equations that can be used?

melodyzaki2E
Posts: 61
Joined: Fri Sep 28, 2018 12:18 am

Re: Change in internal energy equation

Postby melodyzaki2E » Thu Jan 31, 2019 10:46 pm

I think that's the equation for calculating heat. The equations for specific heat capacity and molar heat capacity include moles and grams I think?

Danny Elias Dis 1E
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: Change in internal energy equation

Postby Danny Elias Dis 1E » Fri Feb 01, 2019 10:01 am

If you are asking about calculating molar heat capacity at a constant pressure, use q = n(Cp)(deltaT), where n is the number of moles. Similarly, for a constant volume use Cv. Keep in mind that these can only be used for gases.


Return to “Concepts & Calculations Using First Law of Thermodynamics”

Who is online

Users browsing this forum: No registered users and 1 guest