For which one of the following equation is `DeltaH_(reaction)^(@)` equal to `DeltaH_(f)^(@)` for the product ?

Options

A. `Xe(g) + 2Fe(g) to XeF_(4)(g)`
B. `2CO(g)+O_(2)(g) to 2CO_(2)(g)`
C. `N_(2)(g) + O_(3)(g) to N_(2)O_(3)(g)`
D. `CH_(4)(g) + 2Cl_(2)(g) to CH_(2)Cl_(2)(l) + 2HCl(g)`

Answer

A

Explanation

When one mole of a substance is directly formed from its constituent elements, then the enthalpy change is called heat of formation
For the reaction
`Xe(g) + 2F_(2)(g) to underset(1 "mol")(XeF_(4)(g))`
`DeltaH_("react")^(@)=DeltaH_(f)^(@)`