J.R. S. answered 03/21/22
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The reactions are merely the elements in their standard states needed to make the species of interest.
a). K(s)+ 1/2 Cl2(g) + 1.5 O2(g) ==> KClO3(s)
b). 6C(s) + 6H2(g) + 3O2(g) ==> C6H12O6(s)
c). 1/2 F2(g) ==> F(g)