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Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of...

Physics
WAEC 2002

Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]

  • A. 113,000J
  • B. 117,200J
  • C. 234,400J
  • D. 420,000J
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Correct Answer: Option B
Explanation

mc\(\theta\) + ML = 50 x 4.2 x 20 + 50 x 2260

= 117,200J

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