8.99 Negative Specific Heat Capacity

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Thu Uyen Tran 1B
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

8.99 Negative Specific Heat Capacity

Postby Thu Uyen Tran 1B » Sun Jan 21, 2018 9:51 pm

When solving for the final temperature, I used q=nC(Tf-Ti). Since we are using liquid water's specific heat capacity, 4.184 J/C*g would be plugged in for C, however in the solutions manual, it is negative. Why would it be negative in this case?

Rana YT 2L
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

Re: 8.99 Negative Specific Heat Capacity

Postby Rana YT 2L » Mon Jan 22, 2018 11:06 am

If you put your final answer in Celcius, it is possible that hte temperature could be negative, indicating that is lost heat

Lauren Seidl 1D
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

Re: 8.99 Negative Specific Heat Capacity

Postby Lauren Seidl 1D » Mon Jan 22, 2018 12:20 pm

Yes, the negative value is indicating that it is lost heat.

Jade Fosburgh Discussion 2C
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

Re: 8.99 Negative Specific Heat Capacity

Postby Jade Fosburgh Discussion 2C » Mon Jan 22, 2018 12:45 pm

When you say "it" lost heat, what exactly do you mean? The system lost heat to the surroundings? Since our delta H value for 1 mol of zinc was -20kJ, this means the reaction is exothermic and gives off heat to the surroundings. So does this mean that in an exothermic reaction, the Cs value will always be switched to negative???


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