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how to calculate the average bond enthalpy. The most basic way to calculate enthalpy change uses the enthalpy of the products and the reactants. H Hproducts Hreactants The addition of a sodium ion to a chloride ion to form sodium chloride is an example of a reaction you can calculate this way.
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Bond breaking requires energy and is an Endothermic process. Using the table the single bond energy for one mole of H-Cl bonds is found to be 431 kJ. We can estimate the enthalpy change for a chemical reaction by adding together the average energies of the bonds broken in the reactants and the average energies of the bonds formed in the products and then calculating the difference between the two.
2 2g 1 32g 4g 32g 36g 3 Find the specific heat of your product.
This implies that a total of 463 kilojoules of energy is required to break 1 mole of hydrogen-oxygen single bonds. DH C g 7167 jk. If you know these quantities use the following formula to work out the overall change. DH 4 413 2 498 - 2 805 - 2 41 - 4 464 DH -900 kJ mol -1.
