15.10 Example 10

In a plastic cup of minimum heat capacity, we mix 300 g of water at 10 C, with 185 g of water at 100 C. What is the final temperature in Celsius? (Specific heat of water = 4187 J/kg*K).

Solution with FisicaLab

Select the Thermodynamics group and, inside this, the Calorimetry and gases module. Erase the content of the chalkboard. And add one element Calorimetry and two elements Liquid. As show the image below:

To one of the elements Liquid, we call this A and represent the 300 g of water, we have:

Name

A

m

300 @ g

c

4187

Ti

10 @ C

Tf

Tf @ C

To the other element Liquid, we call this B and represent the 185 g of water, we have:

Name

B

m

185 @ g

c

4187

Ti

100 @ C

Tf

Tf @ C

Note that the final temperature is the same unknown data in both elements, as must be. Now to the element Calorimetry:

Object 1

A

Object 2

B

Object 3

0

Object 4

0

Now click in the icon Solve to get the answer:

Tf = 44.330 C ;
Status = success.