15.5 Example 5

How much heat must be removed to solidify 250 grams of cast iron at its melting point? Give your answer in Joules (heat of fusion of iron = 69.1 cal / g).

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 Change of state solid-liquid and one element Heat extracted. As show the image below:

To the element Change of state, we have:

Name

0

m

250 @ g

cf

69.1 @ cal/g

Sense

<

In the entry of Sense we type < because the change of state is from liquid to solid. Now to the element Heat extracted:

Q

Q

Then click in the icon Solve to get the answer:

Q = 72330.425 J ;
Status = success.