Example from Physics, 11.3 Phase Change and Latent Heat

Calculating Heat Required for a Phase Change (part 1)

Calculate a) how much energy is needed to melt 1.000 kg of ice at 0 $°C$ (freezing point), and b) how much energy is required to vaporize 1.000 kg of water at 100 $°C$ (boiling point).

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Strategy for (a)
Using the equation for the heat required for melting, and the value of the latent heat of fusion of water from the previous table, we can solve for part (a).
Solution
Solution to (a)

The energy to melt 1.000 kg of ice is

$Q = m L_{f} = (1 .000 kg) (334 kJ/kg) = 334 kJ.$
11.18

0 of 2 steps open

How did it go?

Strategy for (a)

Solution

Strategy for (a)

Solution