Change of State - Jamb Physics Past Questions and Answers

Question 56:

• 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

Question 57:

• JAMB 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A. 9.0kjkg\(^{-1}\)
B. 84.0kjkg\(^{-1}\)
C. 134.0kjkg\(^{-1}\)
D. 168.0kjkg\(^{-1}\)