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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Work done during the process when $1\, mol$ of gas is allowed to expand freely into vacuum is:-
  • ✓
    zero
  • B
    $+ve$
  • C
    $-ve$
  • D
    none of these
✓

Answer

Correct option: A.
zero
a
Given: Number of moles $n =1$

Since, gas expand freely in vaccum. $\Rightarrow P_{\text {external }}=0 \,atm$

Work done $=- P _{\text {ext }}\left( V _2- V _1\right)$

$W =0$

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