Question on: JAMB Physics - 1991
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? [the specific latent heat of steam is 2,260,000Jkg-1, specific heat capacity of water is 4200Jkg-1K-1]
A
4200J
B
2,260,OOOJ
C
9,040,000J
D
9,380,000J
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Correct Option: C
Heat by water = mc(\theta)
Heat by steam = mc(\theta) + mL
Difference = mL = 4 x 2,260,000
= 9,040,000J
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