<p>Latent heat of vaporisation of a liquid at 500 K and 1 atm pressure is 10.0 K cal/mol. What will be the change in internal energy&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mo>&#8710;</mo><mi>U</mi></mrow></mfenced></math>&nbsp;of 3 mole of liquid at same temperature?</p>