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kristinstuart
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0The enthalpy change ΔHrxn of the given reaction is 295 kJ/mol
Consider the hypothetical reaction whereby hydroxyl radical reacts with Chlorofluorocarbon. The balanced chemical equation can be expressed as:
\mathbf{OH_{(g)}+ CF_2Cl_{2(g)} \to HOF_{(g)} + CFCl_{2(g)} }
In the above chemical equation, the chemical species participating in the reaction are:
The bond energies of these chemical species are:
The ΔHrxn is the enthalpy change of the reaction and it can be expressed by using the formula:
\mathbf{\Delta H_{rxn} = \sum \ B.E (reactants) - \sum \ B.E (products)}
∴
\mathbf{\Delta H_{rxn} =\Big ( B.E (O-H) + 2B.E(C-F) +2B.E(C-Cl) \Big) - \Big( B.E (O-H) + B.E(O-F) } \\ \\ \mathbf{\ \ \ \ \ \ \ \ \ \ \ \ \ \ +B.E( C-F )+2B.E(C-Cl) \Big)}
By replacing the bond energies into the above expression, we have:
\mathbf{\Delta H_{rxn} =\Big ( 458.9 \ kJ/mol + 2(485 \ kJ/mol) +2(385 \ kJ/mol) \Big)} \\ \\ \mathbf{ - \Big( 458.9 \ kJ/mol + 190 \ kJ/mol +485 \ kJ/mol +2(385 \ kJ/mol)\Big)}
\mathbf{\Delta H_{rxn} =\Big ( 2198.9 \ kJ/mol \Big) - \Big( 1903.9\ kJ/mol\Big)}}
\mathbf{\Delta H_{rxn} =295 \ kJ/mol}
Therefore, provided that the enthalpy change is positive, it implies that the reaction is improbable and non-favorable.
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alananvlo
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