Home › NEET UG › chemistry › c11combust_bondlatt › Per NCERT eqn 5.17, the standard enthalpy of a G…
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.
Related questions
Per NCERT Table 5.2, the Δ_f H° of C(diamond) is which value (note: NOT zero, because grapPer NCERT Problem 5.6, 1 g graphite burnt in a bomb calorimeter (heat capacity 20.7 kJ/K) Per NCERT §5.3, a BOMB CALORIMETER measures which thermodynamic quantity?Per NCERT §5.5(e), the enthalpy of SOLUTION Δ_sol H° of an ionic compound in water is decoPer NCERT §5.5(d), the BORN-HABER cycle for NaCl uses Hess's law and includes which steps?Per NCERT §5.5(d), the LATTICE ENTHALPY of an ionic compound is defined as the enthalpy chPer NCERT Table 5.3(b), the bond enthalpy of N≡N triple bond is which value — among the hiPer NCERT §5.5(c), in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enth