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Per NCERT §5.2.1 (free expansion), what is the work done in FREE EXPANSION of an ideal gas into vacuum (p_ex = 0)?
AZero work, whether process is reversible or irreversible — and for isothermal free expansion of ideal gas, q = 0, ΔU = 0
BEqual to PV
CMaximum work always
DEqual to nRT
Answer & Solution
Correct answer: A. Zero work, whether process is reversible or irreversible — and for isothermal free expansion of ideal gas, q = 0, ΔU = 0
Per NCERT §5.2.1 + Problem 5.2, free expansion: p_ex=0 → w=0. Joule found q=0 also for ideal gas isothermal ⇒ ΔU=0.
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