how is Bond enthalpy useful to calculate enthalpy of a reaction
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Definition
When we were growing up and we were playing with our own set of building blocks, we would piece things together and break them apart, depending on what we wanted to make. For housing and new developments, old structures sometimes need to be remodeled or totally demolished to build a new structure and design. Whether it's building blocks or houses, breaking things and putting them together to make something new is something that requires energy.
When it comes to chemical equations, just like in building blocks, to make something new, chemical bonds are broken so that new bonds can be formed. Breaking bonds require energy, and this energy is what we call bond enthalpy.
Bond enthalpy, also known as bond energy, is the energy that is needed to break a particular bond in a gaseous compound. The unit that expresses bond enthalpy is kilojoules per mole, or kJ/mol. For example, the energy required to break one bond between C and H in the compound methane, CH4, is 413 kJ/mol.
Bond Enthalpy Values
The bond enthalpy values is the value of the energy (the unit is in kJ/mol) required to break a particular chemical bond at a temperature of 298 K or 25 degrees Celsius. For each chemical bond, there are different values of bond enthalpies.