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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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Explanation Video

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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free