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Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of ReactionMedium2 minPYQ_2009

ChemistryMediumsingle choice

Given that $Δ H_{f} (H) = 218 kJ / mol$ , express the $H - H$ bond energy in $kcal / mol$ .

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Answer:

Solution:

Given: $Δ H_{f} (H) = 218 kJ / mol$ i.e., $\frac{1}{2} H_{2} ⟶ H; Δ H = 218 kJ / mol$ $or H_{2} ⟶ 2 H; Δ H = 436 kJ / mol = \frac{436}{4.18} = 104.3 kcal / mol$ Hence, $H$ - $H$ bond energy is $104.3 kcal / mol$ .

Stream:VITEEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction

⏱ 2mℹ️ Source: PYQ_2009

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