• # question_answer 2) Two litres of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume is 10 litres. How much heat is absorbed and how much work is done in the expansion?

Work in free expansion or work done against zero pressure in vacuum is also zero. ${{w}_{\exp }}=-{{P}_{ext}}\times 8=-0\times 8=0$ $\therefore$$q=-w=0$ $\therefore$ Heat change and work done, both are zero.