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Per NCERT eqn 5.17, the standard enthalpy of a GAS-phase reaction from bond enthalpies is approximated as which?
AΣ(reactants) × Σ(products)
BΣ(products) − Σ(reactants)
CΔ_r H° ≈ Σ(bond enthalpies of reactants) − Σ(bond enthalpies of products)
DAlways zero
Answer & Solution
Correct answer: C. Δ_r H° ≈ Σ(bond enthalpies of reactants) − Σ(bond enthalpies of products)
Per NCERT eqn 5.17, Δ_r H° = Σ BE(reactants broken) − Σ BE(products formed). Approximate; valid only for gases.
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