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  4. 1g of water, of volume 1 cm3 at 100°C, is converted into steam at same temperature under normal atmospheric pressure (≃ ) 1× 105Pa . The volume of steam formed equals 1671 cm3. If the specific latent heat of vaporisation of water is 2256 J/g, the change in internal energy is,

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Q. 1g of water, of volume 1 cm3 at 100°C, is converted into steam at same temperature under normal atmospheric pressure (≃ ) 1×105Pa . The volume of steam formed equals 1671 cm3. If the specific latent heat of vaporisation of water is 2256 J/g, the change in internal energy is,

NEETNEET 2019Thermodynamics

Solution:

Q=ΔU+W
⇒mL=ΔU+P(V2−V1)
⇒1(2256)=ΔU+1×105(1670×10−6)
⇒ΔU=2089J