SATHEE: Thermodynamics Question 219

Thermodynamics Question 219

Question: 540 calories of heat convert 1 cubic centimeter of water at $100^{o} C$ into 1671 cubic centimeter of steam at $100^{o} C$ at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly

Options:

A) 540 cal

B) 40 cal

C) Zero cal

D) 500 cal

Show Answer

Answer:

Correct Answer: B

Solution:

Amount of heat given $= 540 c a l o r i e s$ Change in volume $Δ V = 1670 c . c$

Atmospheric pressure $P = 1.01 \times 10^{6} d y n e / c m^{2}$

Work done against atmospheric pressure $W = P Δ V$

$= \frac{1.01 \times 10^{6} \times 1670}{4.2 \times 10^{7}} \approx 40 c a l$

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Thermodynamics Question 219

Question: 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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Question: 540 calories of heat convert 1 cubic centimeter of water at $100^{o} C$ into 1671 cubic centimeter of steam at $100^{o} C$ at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly