Specific latent heats of fusion and vaporization - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 2017

Calculate the specific latent heat of vaporization of steam of 1.13 x 106J of heat energy is required to convert 15kg of steam to water.

A. 7.53 x 105 Jkg\(^{-1}\)
B. 7.53 x 10-2Jkg\(^{-1}\)
C. \(7.53 \times 10^{4}\)Jkg\(^{-1}\)
D. 7.53 x 10-3Jkg\(^{-1}\)

Question 17:

• 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