Answer:
To determine the heat needed to melt 40g of ice we use the following formula:
[tex]Q=m.\Delta H_f[/tex]Where:
m is the mass of water
Hf is the heat of fusion
In this case we consider that the process hapens at 0°C.
The average heat of fusion is:
[tex]\Delta H_f=333\frac{J}{g}[/tex]So we calculate:
[tex]Q=40g.333\frac{J}{g}=13320J[/tex]Now we convert the value to kJ:
[tex]Q=13320J.\frac{1kJ}{1000J}=13.32kJ[/tex]So the answer is 13.32kJ.
