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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
A gas occupies $1.5$ litre at $S.T.P.$ It is provided with $300$ joule of heat so that its volume becomes $2$ litre at a pressure of $1\,atm.$ The value of $\Delta U$ for the
process is.....$joule$
  • ✓
    $249.5$
  • B
    $160.8$
  • C
    $236.8$
  • D
    None of these
✓

Answer

Correct option: A.
$249.5$
a
$\Delta \mathrm{U}=\mathrm{q}+\mathrm{w}$

$=300+(-\mathrm{P} \Delta \mathrm{V})$

$=300-1(2-15) \times 101.3$

$=249.5\, \mathrm{J}$

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