When silver is poured into the mould the it will solidify
In this process the phase of the Silver block will change from liquid to solid.
This phase change will lead to release in heat and this heat is known as latent heat of fusion.
The formula to find the latent heat of fusion is given as
[tex]Q = mL[/tex]
here given that
[tex]m = mass = 500 g[/tex]
[tex]L = 111 kJ/kg[/tex]
now we can find the heat released
[tex]Q = 0.5 * 111 kJ[/tex]
[tex]Q = 55.5 kJ[/tex]
So it will release total heat of 55.5 kJ when it will solidify