Bond formation and Bond breaking

[J_Rodriguez_Dis2k]

I am wondering why the bond breaking goes first in the equation if its usually final then initial. Isn't the bond breaking initial and the bond creation final. So why is the bond breaking in the place of the final product ?

[Lisa Leung 2H]

This is because breaking bonds require energy while forming bonds release energy, meaning the enthalpy for breaking bonds would be positive and the enthalpy for forming bonds would be negative. Generally, equations are written as a positive value plus a negative value and not a negative value plus a positive value so the bond breaking is in place of the final product.