At `25^(@)C` the standard enthalpy of formation of freon gas `(CHClF_(2))` is -480.0 `kJ*mol^(-1)`. Wirte down of therrmochemical equation representing the formation reaction of the compound.

Explanation

The constituent elements of the compound, `CHClF_(2)` are carbon, hydrogen, chlorine and fluorine. The standard states of these elements are C(Graphite, s), `H_(2)(g),Cl_(2)(g) and F_(2)(g)`. Thus, themochemical equation for the formation reaction-
C(graphite, s)`+(1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g)+F_(2)(g)toCHClF_(2)(g),`
`DeltaH_(f)^(0)[CHClF_(2)(g)]=-480.0kJ*mol^(-1)`