Calculating q

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Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

Calculating q

Postby Tiffany Chao 2H » Sun Feb 02, 2020 5:26 pm

I'm doing some heat problems from 4A. I've noticed that to calculate q, sometimes you do q = mass x specific heat capacity x delta T. Other times, it's just q = specific heat capacity x delta T. When do you know to multiply mass or not?

Thanks

Adam Kramer 1A
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: Calculating q

Postby Adam Kramer 1A » Sun Feb 02, 2020 6:13 pm

It may differ depending on if they ask for heat capacity, specific heat capacity, or molar heat capacity. Depending on the wording, it may ask for different values.

Aarushi Solanki 4F
Posts: 107
Joined: Sat Jul 20, 2019 12:17 am

Re: Calculating q

Postby Aarushi Solanki 4F » Sun Feb 02, 2020 6:21 pm

If the heat capacity is given, the m and n aren't in the equation. This is because specific heat capacity is given per mass unit, molar heat capacity is given per mole, and heat capacity is simply J/K.

nicolely2F
Posts: 149
Joined: Sat Sep 14, 2019 12:17 am

Re: Calculating q

Postby nicolely2F » Sun Feb 02, 2020 6:30 pm

I think that what you're getting mixed up is heat capacity (symbol is capital "C") and specific heat capacity (in high school for me it was "c" but Prof Lavelle and the book are using Cs). C = Cs*m and q = C*ΔT, so when you plug Cs*m into q = C*ΔT, you get q = Cs*m*ΔT

Owen-Koetters-4I
Posts: 50
Joined: Fri Sep 28, 2018 12:16 am

Re: Calculating q

Postby Owen-Koetters-4I » Sun Feb 02, 2020 6:57 pm

it depends on if you're calculating heat capacity, specific heat capacity, or molar heat capacity

Trent Yamamoto 2J
Posts: 111
Joined: Sat Aug 17, 2019 12:18 am

Re: Calculating q

Postby Trent Yamamoto 2J » Sun Feb 02, 2020 10:43 pm

Check to see what you are given. Based on whether you are solving for specific heat capacity or q, then you would know whether or not to use the mass


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