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Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific...

Physics
JAMB 2021

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

  • A. 530000J
  • B. 23200J
  • C. 17200J
  • D. 130000J
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Correct Answer: Option D
Explanation

H = mc\(\bigtriangleup\theta\) + mL

H = ?

m = 50g, c = 4.23J/gk,L = 2260, \(\bigtriangleup\theta\) = 80ºC

H = 50 [4.23 x 80 + 2260]

= 129920 \(\approx\) 130,000J

There is an explanation video available below.


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