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For which one of the following equations...

For which one of the following equations `DeltaH_(r)^(@)` equal to `DeltaH_(f)^(@)` for the product ?

A

`N_(2)(g)+O_(3)(g)toN_(2)O_(3)(g)`

B

`CH_(4)(g)+2Cl_(2)(g)toCH_(2)Cl_(2)(l)+2HCl(g)`

C

`Xe(g)+2F_(2)(g)toXeF_(4)(g)`

D

`2CO(g)+O_(2)(g)to2CO_(2)(g)`

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