Categories: Physics JAMB

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg¯¹k¯¹ (specific latent heat of vaporization of water is 2260jg¯¹

A. 530000J
B. 23200J
C. 17200J
D. 130000J

Correct Answer:

Option D = 130000J

Explanation

H = mc△θ + mL

H = ?

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

H = 50 [4.23 x 80 + 2260]

= 129920 ≈ 130,000J

SEE ALSO The velocity of sound in air at 16°C is 340ms‾¹. What will it be when the pressure is doubled and its temperature raised to 127°C?
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