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### Change in internal energy equation

Posted: **Thu Jan 31, 2019 10:33 pm**

by **Amy Lefley 1J**

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?

### Re: Change in internal energy equation

Posted: **Thu Jan 31, 2019 10:46 pm**

by **melodyzaki2E**

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?

### Re: Change in internal energy equation

Posted: **Fri Feb 01, 2019 10:01 am**

by **Danny Elias Dis 1E**

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.