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Per NCERT eqn 5.15, the standard enthalpy of REACTION from formation enthalpies is computed as which?
AΔ_r H° = Σ Δ_f H°(reactants) − Σ Δ_f H°(products)
BΔ_r H° = Σ Δ_f H° / number of bonds
CΔ_r H° = Π Δ_f H°
DΔ_r H° = Σ a_i Δ_f H°(products) − Σ b_i Δ_f H°(reactants)
Answer & Solution
Correct answer: D. Δ_r H° = Σ a_i Δ_f H°(products) − Σ b_i Δ_f H°(reactants)
Per NCERT eqn 5.15, Δ_r H° = Σ(products) − Σ(reactants), weighted by stoichiometric coefficients.
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