Specific Latent Heat

• What is specific latent heat?

  Energy required to change state without temperature change
• What happens to temperature when a substance changes state?

  Temperature remains constant during the change
• What is the latent heat of fusion?

  Energy needed to change solid to liquid
• How much energy is required to melt 1 kilogram of ice?

  334,000 joules
• What is the specific latent heat of vaporization?

  Energy needed to change liquid to vapor
• How do you calculate energy change during a state change?

  Energy = mass × specific latent heat
• What is the formula for energy change during a state change?

  Energy = mass × specific latent heat
• What is the energy required to convert 0.5 kg of ice to water?

  167,000 joules
• What is the energy required to convert 0.15 kg of ethanol to vapor?

  126,900 joules
• What is the specific latent heat of fusion of water?

  334,000 joules per kilogram
• What is the specific latent heat of vaporization of ethanol?

  846,000 joules per kilogram
• What are the key concepts of specific latent heat?

  • Specific latent heat: energy for state change
  • Latent heat of fusion: solid to liquid
  • Latent heat of vaporization: liquid to vapor
  • Energy calculation: mass × specific latent heat
• How do you solve problems involving specific latent heat?

  1. Identify mass of substance
  2. Determine specific latent heat value
  3. Use formula: Energy = mass × specific latent heat
  4. Calculate energy change