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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
For a gaseous reaction, $A_{(g)} + 3B_{(g)} \to 3C_{(g)} + 3D_{(g)}$
The value of $\Delta E$ is $17 \,kcal$ at $27\,^oC$. Value at $\Delta H\, (kcal)$ will be
  • A
    $15.8$
  • ✓
    $18.2$
  • C
    $20$
  • D
    $16.4$
✓

Answer

Correct option: B.
$18.2$
b
$ \Delta \mathrm{H} =\Delta \mathrm{E}+\Delta \mathrm{n}_{\mathrm{g}} \mathrm{RT} $

$=17+2 \times 2 \times 10^{-3} \times 300=18.2 \,\mathrm{kcal} $

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