<p>One mole of an ideal gas at 300K is expanded isothermally from an initial volume of 1 litre to 10 litre. The&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#8710;</mo></math>U for this process is (R = 2 cal&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>K</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>&#160;</mo><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>)</mo></math>:</p>