latent heat

• solids -> least energy to make (don't have to break any bonds)
• liquids - less energy to make (doesn't have to break every bond)
• gases -> most energy to make -> have to break every bond
• latent heat = hidden heat -> energy increases but temperature doesn't -> is breaking bonds not wasted
• latent heat units = j/kg
• don't convert kg
• latent heat graph ---> temp directly proportional to energy

  A) boiling point

  B) latent heat of evaporation

  C) melting point

  D) latent heat of melting

  E) energy needed to melt ice

  F) energy needed to boil water

  
• L = latent heat
• Q = energy
• Q = ml
• latent heat of evaporation of a material = 10,000j/kg

  4.6MJ of energy is supplied

  mass of gas created? = 460kg