Calculating heat (q)

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

Calculating heat (q)

Postby Paula Sing 1J » Wed Jan 24, 2018 11:07 pm

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)

Postby Nancy Dinh 2J » Wed Jan 24, 2018 11:10 pm

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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Re: Calculating heat (q)

Postby Clara Hu 1G » Wed Jan 24, 2018 11:25 pm

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
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Re: Calculating heat (q)

Postby Melodie Oh 2A » Thu Jan 25, 2018 3:54 pm

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
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Joined: Sat Jul 22, 2017 3:01 am

Re: Calculating heat (q)

Postby Joanne Guan 1B » Thu Jan 25, 2018 11:43 pm

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.


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