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

Assessment: JAMB UTME - Physics - 2021 Subject: Physics

Question 1 Report

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

Answer Details

H = mc?? ? ?  + mL

H = ?

m = 50g, c = 4.23J/gk,L = 2260, ?? ? ?  = 80ºC

H = 50 [4.23 x 80 + 2260]

= 129920 ? ?  130,000J

Read lesson note on Heat Energy (WAEC)
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