## Calculating heat (q)

Paula Sing 1J
Posts: 36
Joined: Fri Sep 29, 2017 7:06 am

### Calculating heat (q)

How do you know when to use q=mc(delta)T vs when to use q=nc(delta)T?

Nancy Dinh 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

### Re: Calculating heat (q)

Paula Sing 1J wrote:How do you know when to use q=mc(delta)T vs when to use q=nc(delta)T?

This all depends on whether you have the specific heat capacity (Csp) or the molar heat capacity (Cm). If you have the specific heat capacity, use q=m*Csp*deltaT. If you have the molar heat capacity, use q=n*Cm*delta T. Note that m = mass (g) and n = moles.

Clara Hu 1G
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Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

### Re: Calculating heat (q)

You would use q=mc(delta)T if you knew the mass of a substance and had the specific heat capacity while you would use q=nc(delta)T if you knew the number of moles and had the molar heat capacity because you want the final units of q to be in Joules.

Melodie Oh 2A
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

### Re: Calculating heat (q)

This will depend on the c value that you have. If you have the molar heat capacity and the second equation will be used and if you have the specific heat capacity the first one will be used.

Joanne Guan 1B
Posts: 30
Joined: Sat Jul 22, 2017 3:01 am

### Re: Calculating heat (q)

Whether you use mCsdeltaT or nCmdeltaT is dependent on what's given initially. mCsdeltaT is used when your information is in terms of grams while nCmdeltaT is used when you information is in terms of moles.