• # question_answer 3) Two litres of an ideal gas at 10 atm expands isothermally against a constant external pressure of 1 atm to a volume of 10 litres. How much heat is absorbed and how much work is done by the gas?

$w={{P}_{ext}}\Delta V$ (It is irreversible work) $=1\times 8=8litre-atm$ $=8\times 101.3J$ ${{w}_{\exp }}=-8\times 101.3J$ $=-810.4J$ $q={{w}_{\exp }}=810.4J$