For a reaction, `C_((s))+O_(2(g))rarrCO_(2(g))`
What is the relation between enthalpy of reaction `(DeltaH_(r)),` enthalpy of formation of `CO_(2)(DeltaH_(f))` and enthalpy of combustion of carbon `(DeltaH_("comb"))` ?

Options

A. `DeltaH_(r) gt DeltaH_(f) = DeltaH_("comb")`
B. `DeltaH_(r)=DeltaH_(f)=DeltaH_("comb")`
C. `DeltaH_(r)=DeltaH_(f)+DeltaH_("comb")`
D. `DeltaH_(r)=2xxDeltaH_(f)`

Answer

B

Explanation

Since the reaction shows combustion of one mole carbon, `DeltaH_("reaction")` is enthalpy of combustion since 1 mole of `CO_(2)` is formed. `DeltaH_("reaction")` is also the enthalpy of formation of `CO_(2)`.