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Per NCERT Problem 5.2, when 2 L of an ideal gas at 10 atm expands isothermally into VACUUM to total volume 10 L, how much heat is absorbed and how much work is done?
Aq = 10, w = 10
Bq = 8 L·atm, w = −8 L·atm
Cq = 39.4 L·atm, w = −39.4 L·atm
Dq = 0 and w = 0 — no work done and no heat absorbed (free expansion against zero external pressure)
Answer & Solution
Correct answer: D. q = 0 and w = 0 — no work done and no heat absorbed (free expansion against zero external pressure)
Per NCERT Problem 5.2, free expansion: p_ex=0, so w=0 and q=0. For irreversible against 1 atm (Problem 5.3): q = 8 L·atm.
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