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What is the difference in the amount of heat given out by 4k...

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

Correct answer is C

Heat by water = mc\(\theta\)

Heat by steam = mc\(\theta\) + mL

Difference = mL = 4 x 2,260,000

= 9,040,000J