![]() ![]() When using these values it is important to remember that: Note that all values of bond energy, bond enthalpy, are positive because energy must be absorbed to break covalent bonds between atoms.īreaking covalent bonds between atoms is an endothermic process. The amount of energy required to break particular bonds, values for bond energy or bond enthalpy, are often presented in a table like the one below: (3) No ads = no money for us = no free stuff for you! Bond Energy, Bond Enthalpy, Values (iv) Substitute bond energy values into the equation and solve for ΔH (reaction) ![]() ΔH (reaction) = ΣH (reactant bonds broken) - ΣH (product bonds formed) (iii) Write the general equation for the enthalpy change for reaction (heat of reaction), ΔH (reaction): ![]() (ii) Write a structural formula for each reactant and product If a reactant or product is NOT in the gaseous state, you will need to use Hess's Law to include the relevant energy (enthalpy) for the change of state. (i) Write the balanced chemical equation, with all reactants and products in the gaseous state.
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