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When 1 \mathrm{gm} of water changes from liquid to vapour phase at constant pressure of 1 atmosphere, the volume increases from \mathrm{1\mathrm{~cm}^3\: to\: 1671}  c.c. The heat of vaporization at this pressure is \mathrm{540 \mathrm{cal} / \mathrm{gm}}. Find The work done \mathrm{\text{ (in\: J )}} in change of phase

 

Option: 1

\mathrm{170.78 \, Joule}
 


Option: 2

\mathrm{200.67 \: Joule}
 


Option: 3

\mathrm{190.78 \: Joule}

 


Option: 4

\mathrm{ 168.67\: Joule}


Answers (1)

best_answer

As the process is isobaric

\mathrm{ \Delta W=\int P d V=P\left[V_F-V_l\right] }

\mathrm{ =1.01 \times 10^6[1671-1]=1688.7 \times 10^6 \text { erg } }

\mathrm{ =168.87 \text { Joule }\left[1 \text { erg }=10^{-7} \mathrm{~J}\right] }





 

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chirag

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