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Chemical Thermodynamics — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryChemical Thermodynamics1 Mark
MCQ
Identify the invalid equation.
  • A
    $\Delta H=\Sigma H_{\text {products }}-\Sigma H_{\text {reactants }}$
  • B
    $\Delta H=\Delta U+P \Delta V$
  • ✓
    $\Delta H_{(\text {reaction })}^{ o }=\Delta H_{(\text {product bonds })}^{ o }-\Delta H_{(\text {reactant bonds })}^{ o }$
  • D
    $\Delta H=\Delta U+\Delta n R T$
✓

Answer

Correct option: C.
$\Delta H_{(\text {reaction })}^{ o }=\Delta H_{(\text {product bonds })}^{ o }-\Delta H_{(\text {reactant bonds })}^{ o }$
(c): Enthalpy change, $\Delta, H=\Sigma$ Bond energies or enthalpies of reactants - $\Sigma$ Bond energies of enthalpies of products.

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