Calculating S-F Bond Enthalpy from Standard Enthalpy of Formation Values

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In summary, the conversation discusses the values of standard enthalpies of formation for SF6(g), S(g), and F(g), and how to determine the average S-F bond enthalpy in SF6. It is mentioned that the bond enthalpy is equal to the negative of the enthalpy of formation from constituent atoms, and the calculation for the average bond enthalpy is provided. The concept of enthalpy for the entire reaction and the difference between enthalpy of formation and enthalpy of reaction for SF6 are also discussed.
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Homework Statement


The values of standard enthalpy of formation of SF6(g), S(g), F(g) are -1100, 275, 80 kJ/mol resp. What is the average S-F bond enthalpy in SF6?


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The Attempt at a Solution


I read that the bond enthalpy is negative of enthalpy of formation from constituent atoms.
So average bond entalpy of S-F bond is 1100/6= 183.33kJ/mol. Is this correct?
 
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  • #2
The heat of a reaction is = (ΔH of Products - ΔH of Reactants).

Consider the balanced equation SF6(g) --> S(g) + 6F(g).

Try calculating the enthalpy for the entire reaction based on the information given to you, and go from there.
 
  • #3
What is the difference between enthalpy of entire reaction and enthalpy of formation of SF6? I think the enthalpy of formation is equal to enthalpy of reaction as SF6 is formed from its constituent atoms.
 

FAQ: Calculating S-F Bond Enthalpy from Standard Enthalpy of Formation Values

What is bond enthalpy?

Bond enthalpy is the amount of energy required to break a chemical bond between two atoms in a molecule.

How is bond enthalpy measured?

Bond enthalpy is typically measured in units of kilojoules per mole (kJ/mol) using a technique called calorimetry, which involves measuring the heat released or absorbed during a reaction.

What factors affect bond enthalpy?

The strength of a chemical bond, and therefore its bond enthalpy, is influenced by factors such as the type of bond (single, double, or triple), the types of atoms involved, and the molecular structure of the molecule.

What is the relationship between bond enthalpy and bond length?

In general, the shorter the bond length, the stronger the bond and the higher the bond enthalpy. This is because shorter bonds indicate a greater overlap of electron orbitals between atoms, resulting in a stronger attraction.

How is bond enthalpy used in chemical reactions?

Bond enthalpy is an important factor in chemical reactions because it determines the amount of energy needed to break bonds in reactant molecules and the amount of energy released when new bonds form in product molecules. This information can be used to predict the overall energy change of a reaction and its feasibility.

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