Use the bond energies provided to estimate ΔH°rxn for the reaction below.

Question

Question

Use the bond energies provided to estimate ΔH°_rxn for the reaction below.

PCl₃(g) + Cl₂(g) → PCl₅(l)
ΔH°_rxn = ?

Answer 1

✔ Recommended Answer

Answer #1

deltaH⁰_rxn = 3 * deltaH⁰_b ( P - Cl ) + deltaH⁰_b(Cl-Cl) - 5 * deltaH⁰_b(P-Cl)

= 3 * ( 331 ) + ( 243 ) - 5 * ( 331 )

= - 419 kJ

Answer 2

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