Question

Estimate ΔHrxn for the following chemical reaction using the bond enthalpies in the table found here....

Estimate ΔHrxn for the following chemical reaction using the bond enthalpies in the table found here. Report your answer to zero decimal places in standard notation (i.e. 123. kJ *For numbers ending in zero, be sure to include the decimal!*).



C2H2(g) + Cl2(g) → C2H2Cl2(g)

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Answer #1

H rxn = H products - H reactants

H0 for ethene = +52.4 KJ/mole

H0 for Cl2 = 0 KJ/mole

H0 for ethylene chloride = -125.4 KJ/mole

Therefore, H rxn = H products - H reactants

H rxn = -125.4 - (52.4+0) = 73..0 KJ/mole

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