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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).
  • A. 533000J
  • B. 230000J
  • C. 117200J
  • D. 113000J
  • E. 4200J
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Correct Answer: Option C
Explanation
Q = McΔθ + ml
Q = {50 x 4.2 x (100 - 80) + 50 x 2260} 117200J.
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