1. Tardigrade
  2. Question
  3. Physics
  4. Given that 1 g of water in liquid phase has volume 1 cm3 and in vapour phase 1671 cm3 at atmospheric pressure and the latent heat of vaporization of water is 2256 J/g; the change in the internal energy in joules for 1 g of water at 373 K when it changes from liquid phase to vapour phase at the same temperature is:

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Q. Given that 1g of water in liquid phase has volume 1cm3 and in vapour phase 1671cm3 at atmospheric pressure and the latent heat of vaporization of water is 2256J/g; the change in the internal energy in joules for 1g of water at 373K when it changes from liquid phase to vapour phase at the same temperature is:

JEE MainJEE Main 2013Thermal Properties of Matter

Solution:

ΔQ=ΔU+ΔW⇒2256=ΔU+P0ΔV=ΔU+105(1670×10−6)
⇒ΔU=2089J