Lesson: Specific Latent Heat
In this lesson, we will learn how to use the formula E = mL to calculate the amount of energy absorbed or released by a change in the state of a material.
Sample Question Videos
Worksheet: 14 Questions • 3 Videos
A metal at the temperature at which it melts is heated until all of the metal has become liquid. It takes 41 kJ to completely melt the metal, and its mass is 0.2 kg. What is the specific latent heat of fusion of the metal?
A substance, which is initially at 20℃ and solid, is heated. The temperature of the substance is recorded over time, and this data is shown in the graph.
What is the melting point of the substance?
A 10 kg block of ice is converted to water vapour. The block of ice starts at −20℃; first, it must be completely melted, and then it is heated to 100℃. Find the energy required to do this. Use a value of J/kg⋅℃ for the specific heat capacity of ice and use a value of J/kg⋅℃ for the specific heat capacity of water. Use a value of 334 kJ/kg for the latent heat of fusion of water and use a value of kJ/kg for the latent heat of vaporisation of water. Give your answer to 3 significant figures.