Enthalpy of fusion [ENDORSED]

[Cristian Carrasco 1F]

for problem 2 on the midterm, how would you find the delta H fusion of the ice cream?

[Nha Dang 2I]

You set it up as q=mcdeltaT + deltaH(fusion)(1/2m), which becomes deltaH(fusion)=((2)(q-mcdeltaT))/(m). Then you just plug in the numbers and you end up getting 3.7 kJ/g.

[Erica Nagase 1H]

The total energy put into the ice cream is equal to the energy needed to raise the temperature from -2.8 to 0degC plus the energy needed to melt it ()

[Liz White 1K]

Can someone please explain the answer to this question in more detail? I don't understand why we use q=mcdeltaT + deltaH. Also, I plugged the values into this and got an incorrect answer.

[Angela 1K]

We use the equation to find the q_{ice cream} because we have to account for the fact that it changes from solid (frozen) to liquid (melted). The accounts for the ice cream changing and then accounts for the phase change, where .