Heat Capacity

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Timothy Kim 1B
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am

Heat Capacity

Postby Timothy Kim 1B » Thu Jan 18, 2018 3:35 pm

For heat capacity/specific heat, do we use kJ or J? Or does it really matter, as long as we stay consistent?

Jasmine Wu 1L
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Joined: Thu Jul 27, 2017 3:00 am
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Re: Heat Capacity

Postby Jasmine Wu 1L » Thu Jan 18, 2018 4:00 pm

The units for heat capacity/specific heat capacity are in Joules. For example, the specific heat capacity for water is 4.18 J.K-1.g-1

I guess it would be fine to use kJ or J, as long as you do your conversions in the end to match the units for heat capacity/specific heat capacity. Remember: (1 kJ = 1000 J)

Shawn Patel 1I
Posts: 54
Joined: Thu Jul 27, 2017 3:01 am

Re: Heat Capacity

Postby Shawn Patel 1I » Thu Jan 18, 2018 4:30 pm

Hey,
Table 8.2 uses Joules for specific and molar heat capacity, but it can be converted to kilojoules if heat energy is present in large values.

Jasmin Tran 1J
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: Heat Capacity

Postby Jasmin Tran 1J » Fri Jan 19, 2018 1:56 am

Just remember to convert to the correct units whenever it is asked for in a problem and you'll be fine!

Matt_Fontila_2L_Chem14B
Posts: 39
Joined: Fri Sep 29, 2017 7:07 am

Re: Heat Capacity

Postby Matt_Fontila_2L_Chem14B » Fri Jan 19, 2018 4:11 am

More often than not, our final answers are in kilojoules. The only times I can think of using joules were when we calculated using specific heat capacity as stated above.

I usually leave my answers in kilojoules unless stated otherwise.

Alex Nechaev 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Heat Capacity

Postby Alex Nechaev 1I » Sat Jan 20, 2018 1:02 pm

I don't think it really matters whether you leave your final answer in kJ or Joules, but it's probably more likely that you'll see values in kJ, especially larger values of heat energy.

Merzia Subhan 1L
Posts: 33
Joined: Thu Jul 13, 2017 3:00 am

Re: Heat Capacity

Postby Merzia Subhan 1L » Sat Jan 20, 2018 3:46 pm

I would recommend sticking with Joules throughout the calculation of a problem and converting to kJ at the end because for specific heat, the values are in Joules and you might accidentally use kJ and mess up


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