## Change in internal energy equation

$\Delta U=q+w$

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

### Change in internal energy equation

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

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

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.