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:
250 @ g
69.1 @ cal/g
In the entry of Sense we type < because the change of state is from liquid to solid. Now to the element Heat extracted:
Then click in the icon Solve to get the answer:
Q = 72330.425 J ; Status = success.