3.2.3 Specific Latent Heat

• What is specific latent heat defined as?

  Energy to change state
• Specific latent heat is measured in joules per kilogram
• The formula for specific latent heat is $E =$$mL$
• What does $E$ represent in the formula for specific latent heat?


  Energy required
• Match the type of latent heat with its value and process:

  Fusion ↔️ $3.34 × 10^{5}$ J/kg, Solid to Liquid

  Vaporization ↔️ $2.26 × 10^{6}$ J/kg, Liquid to Gas
• Steps involved in calculating the energy required for latent heat of fusion

  1️⃣ Determine the mass of the substance

  2️⃣ Identify the specific latent heat of fusion

  3️⃣ Use the formula $E =$$mL_{f}$

  4️⃣ Calculate the energy required
• What state change is associated with latent heat of fusion?

  Solid to liquid
• Latent heat of vaporization is measured in joules per kilogram.
• The energy required to boil 1 kg of water with a specific latent heat of vaporization of $2.26 × 10^{6}$ J/kg is $2.26 × 10^{6}$ J
• What is the latent heat of fusion defined as?

  Energy to change solid to liquid
• What does the variable $E$ represent in the formula for latent heat of fusion?


  Energy required
• The specific latent heat of fusion is measured in units of J/kg
• How much energy is required to melt 3 kg of ice if its specific latent heat of fusion is $3.34 × 10^{5} J / kg$?


  $1.002 × 10^{6} J$
• The latent heat of fusion is specific to each substance.
• The latent heat of vaporization is the energy needed to change 1 kg of a substance from a liquid to a gas without changing its temperature.
• What formula is used to calculate the energy required for vaporization?

  $E =$$mL_{v}$
• The specific latent heat of vaporization is denoted by L_{v}
• The specific latent heat of vaporization for water is 2.26 × 10^{6} J / kg</latex>.
• How much energy is required to vaporize 1 kg of water if its specific latent heat of vaporization is $2.26 × 10^{6} J / kg$?


  $2.26 × 10^{6} J$
• The latent heat of vaporization is measured in units of J/kg
• What is specific latent heat defined as?

  Energy to change state of 1 kg
• What is the formula to calculate the energy required using specific latent heat?

  $E =$$mL$
• Specific latent heat is denoted by the variable $L$.
• Specific latent heat is measured in units of J/kg
• How much energy is needed to melt 2 kg of ice if its specific latent heat of fusion is $3.34 × 10^{5} J / kg$?


  $6.68 × 10^{5} J$
• To solve problems involving specific latent heat, the formula used is E = mL
• How much energy is needed to melt 5 kg of ice if its specific latent heat of fusion is $3.34 × 10^{5} J / kg$?


  $1.67 × 10^{6} J$
• What is the latent heat of fusion defined as?

  Energy needed to melt 1 kg
• The formula to calculate the energy required for melting is mL_{f}
• What are the units of specific latent heat of fusion?

  J/kg
• The specific latent heat of fusion of ice is approximately $3.34 × 10^{5} J / kg$.
• The formula for latent heat of fusion is E = mL_{f}
• What is the latent heat of vaporization defined as?

  Energy needed to vaporize 1 kg
• The formula to calculate the energy required for vaporization is mL_{v}
• What is the specific latent heat of vaporization of water?

  $2.26 × 10^{6} J / kg$
• The latent heat of fusion for water is less than its latent heat of vaporization.
• Match the term with its definition:

  Specific Latent Heat ↔️ Energy to change 1 kg without changing temperature

  Latent Heat of Fusion ↔️ Energy to change solid to liquid

  Latent Heat of Vaporization ↔️ Energy to change liquid to gas
• What is the formula to calculate the energy required using specific latent heat?

  $E =$$mL$
• To melt 2 kg of ice with $L =$$3.34 × 10^{5} J / kg$, the energy needed is $6.68 × 10^{5} J$
• The variable $L$ in the specific latent heat formula represents energy required.


  False