Physics 5054 · O Level · Melting, boiling and evaporation

Melting, boiling and evaporation — practice question

A boiling liquid takes in thermal energy (heat) at a rate of $450\,\text{W}$. The specific latent heat of vaporisation is $2.7 \times 10^6\,\text{J kg}^{-1}$. What mass of liquid is vaporised in $9.0\,\text{minutes}$?

  • A$1.5\,\text{g}$
  • B$11\,\text{g}$
  • C$90\,\text{g}$
  • D$5400\,\text{g}$

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