Question

How much heat is required to completely melt a 19.5 gram sample of ice at 0 degrees Celsius?

Answer 1

`65325J` or `65.3kJ`

Explanation:

Well, we would have to use the formula:

`q=mL_f`

since we want to calculate the energy used to melt the substance

`m` is the mass of the substance in `kg`

`L_f` is the latent heat of fusion of the substance (since ice turns to water)

Here, `m=0.195kg`, `L_f=3.35*10^5 J"/"kg`

`:.q=0.195cancel(kg)*3.35*10^5J"/"cancel(kg)=65325J~~65.3kJ`

Source:

http://www.dummies.com/education/science/physics/how-to-calculate-the-latent-heat-needed-to-cause-a-phase-change/