Calculate the heat energy required to vapourize 50g of water initially at 80oC if the…

Physics WAEC 1989

Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).

  • 533000J
  • 230000J
  • 117200J checkmark
  • 113000J
  • 4200J

The correct answer is: C

Explanation

Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
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