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⇒ {4EC-H + EC=C + EH-Cl} - {5EC-H + EC-C + EC-Cl}
= {4(412) + 609 + 426} - {5(412) + 345 + 326}
= { 2683 } - { 2731 }
= - 48
Maka besarnya entalpi adalah - 48 kJ/mol