Physics 5054 · O Level · Melting, boiling and evaporation

Melting, boiling and evaporation — practice question

An electric heater produces thermal energy for three minutes, and this is used to melt wax. At the start, the wax is already at its melting point of $60\degree\text{C}$. The specific latent heat of the wax is $220\ \text{J g}^{-1}$. The heater transfers $7700\ \text{J}$ of thermal energy to the wax. How much wax melts?

  • A$0.58\ \text{g}$
  • B$1.7\ \text{g}$
  • C$12\ \text{g}$
  • D$35\ \text{g}$

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