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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Heat of reaction for $C_6H_{12}O_{6(s)} + 6O_{2(g)} \to 6CO_{2(g)} + 6H_2O_{(v)}$ at constant pressure is $-651\, K\, cal$ at $17\,^oC$. Calculate heat of reaction at constant volume at $17\,^oC$......$ K\, cal$
  • ✓
    $-654.48$
  • B
    $-551.50$
  • C
    $+348.9$
  • D
    $+422.5$
✓

Answer

Correct option: A.
$-654.48$
a
$\Delta \mathrm{H}=\Delta \mathrm{E}+\Delta \mathrm{n}_{\mathrm{g}} \mathrm{RT}$

$-651=\Delta E+\frac{6 \times 2 \times 290}{1000}$

$\Delta E=-654.48 \,\mathrm{KCal}$

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