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Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryEnthalpy of ReactionEasy2 minPYQ_2020

ChemistryEasysingle choice

Given that heats of combustion of ethylene, hydrogen and ethane are -337.0, -68.4 and -373.0 kcal respectively at $25 ° C$ , the heat of reaction
$C_{2} H_{4} (g) + H_{2} (g) \to C_{2} H_{6} (g)$ at $25 ° C$ will be

Options:

Answer:

Solution:

$Δ H_{r x n} = Σ Δ H_{c}$ (Reactants) $- Σ Δ H_{c}$ (Products)
$= (- 337.0 kcal - 68.4 kcal) - (- 373 kcal)$
$= (- 337.0 - 68.4 + 373) k c a l = - 32.4 kcal$ .

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction

⏱ 2mℹ️ Source: PYQ_2020

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