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Q.

540 calories of heat convert 1 cubic centimeter of water at  100oC into 1671 cubic centimeter of steam at  100oC at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly

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a

Zero cal

b

500 cal

c

40 cal

d

540 cal

answer is B.

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Detailed Solution

Amount of heat given  =540 calories
Change in volume  ΔV=1670 c.c
Atmospheric pressure  P=1.01×106 dyne/cm2
Work done against atmospheric pressure 
=1.01×106×16704.2×107≈40 cal

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