Use bond energies to determine δhrxn for the reaction between ethanol and hydrogen chloride. ch3ch2oh(g)+hcl(g)→ch3ch2cl(g)+h2o( g)

ΔHrxn = ΣΔH breaking - ΣΔH making

CH₃CH₂OH(g) + HCl(g) →CH₃CH₂Cl(g) + H₂O(g)

the reaction equation is already balanced.
when we look at the equation, the bonds which break are C-O bond and H-Cl bond. The bonds which form are C-Cl bond and O-H bond.
Hence,
ΔHrxn = ΣΔH breaking - ΣΔH making
           = (ΔH(C-O) + ΔH(H-Cl)) - (ΔH(C-Cl) + ΔH(O-H))
           = ((358 + 427) - (339 + 467) kJ/mol
           = -21 kJ/mol

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