Heat Capcity for Water

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Lauryn Jordan 1F
Posts: 76
Joined: Fri Sep 29, 2017 7:07 am

Heat Capcity for Water

Postby Lauryn Jordan 1F » Fri Jan 19, 2018 1:37 am

How do you know which heat capacity to use for water?

Hannah Krusenoski 2L
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

Re: Heat Capcity for Water

Postby Hannah Krusenoski 2L » Fri Jan 19, 2018 1:43 am

I believe water always has a heat capacity of 4.184 J/g°C

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

Re: Heat Capcity for Water

Postby Chris Lamb 1G » Fri Jan 19, 2018 9:28 am

There are different heat capacities for different states, so you need to know the waters's state. Also, you have molar heat capacity as well as specific heat capacity, and the one you choose depends on the units of your given information.

Humza_Khan_2J
Posts: 56
Joined: Thu Jul 13, 2017 3:00 am

Re: Heat Capcity for Water

Postby Humza_Khan_2J » Fri Jan 19, 2018 10:06 am

Bouncing off of the last commenter, the problem should give you which phase the water is in. If it it transitioning from phase to phase, you would have to use either the enthalpy of fusion or the enthalpy of vaporization.

Qining Jin 1F
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

Re: Heat Capcity for Water

Postby Qining Jin 1F » Fri Jan 19, 2018 10:24 am

Specific heat capacity for water(solid) is 2.03 J/g°C, water(liquid) is 4.184 J/g°C, and water(vapor) is 2.01 J/g°C

Yea Eun Lee 1H
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Re: Heat Capcity for Water

Postby Yea Eun Lee 1H » Sat Jan 20, 2018 9:10 pm

We'll be given those values for the test, right?

Wenting Hu 2H
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Re: Heat Capcity for Water

Postby Wenting Hu 2H » Sat Jan 20, 2018 9:11 pm

Yes, it's on the constants and formula sheet on his website.

504754253
Posts: 45
Joined: Fri Jun 23, 2017 11:39 am

Re: Heat Capcity for Water

Postby 504754253 » Sat Jan 20, 2018 9:14 pm

will the heat capacity alway be given

Anne 2L
Posts: 35
Joined: Fri Sep 29, 2017 7:05 am

Re: Heat Capcity for Water

Postby Anne 2L » Sat Jan 20, 2018 9:28 pm

Yes, the heat capacity should always be given. I don't think we have the means to calculate heat capacity outside of a lab setting.


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