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When 1 g of water 100^(@) C is converted into steam at100^(@)C,. It occupies a volumn of 1671 cc at normal atmospheric pressure . Find the increase in internal energy of the molecules of steam.

Answer» <html><body><p></p>Solution :`1" atmosphere" = 1.013xx10^(5) Nm^(-2)` , <br/>volume of 1 gm of water, `V_(1) = 1cc = 10^(-6)m^(3)`, <br/> volume of steams = `1671 cc =1671xx10^(-6) m^(3)` <br/> External <a href="https://interviewquestions.tuteehub.com/tag/work-20377" style="font-weight:bold;" target="_blank" title="Click to know more about WORK">WORK</a> done dW = `P(V_(2)-V_(1)) = 1.013xx10^(5)(1671xx10^(-6) -1xx10^(-6))=1.013xx167=169.2 J`. <br/> Specific latent heat of vaporisation of steam=540cal/g. So, heat supplied to <a href="https://interviewquestions.tuteehub.com/tag/convert-425734" style="font-weight:bold;" target="_blank" title="Click to know more about CONVERT">CONVERT</a> 1g of water into steam. <br/> `Delta Q = 540xx4.2J=2268J` <br/> By first <a href="https://interviewquestions.tuteehub.com/tag/law-184" style="font-weight:bold;" target="_blank" title="Click to know more about LAW">LAW</a> of <a href="https://interviewquestions.tuteehub.com/tag/thermodynamics-12722" style="font-weight:bold;" target="_blank" title="Click to know more about THERMODYNAMICS">THERMODYNAMICS</a> <br/> `Delta <a href="https://interviewquestions.tuteehub.com/tag/u-1435036" style="font-weight:bold;" target="_blank" title="Click to know more about U">U</a> = Delta Q-Delta W = 2268-169.2=2098.8J`</body></html>


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