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

A) $540\ cal$
B) $40\ cal$
C) Zero $cal$
D) $500\ cal$
Explanation

(b) Amount of heat given $= 540\ calories$
Change in volume $\mathrm{\Delta}V = 1670\ c.c$
Atmospheric pressure $P = 1.01 \times 10^{6}\ dyne/cm^{2}$
Work done against atmospheric pressure
$W = P\mathrm{\Delta}V = \frac{1.01 \times 10^{6} \times 1670}{4.2 \times 10^{7}} = 40\ cal$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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