If `DeltaH_(f)(X)`, `DeltaH_(f)(Y)`, `DeltaH_(f)(R )` and `DeltaH_(f)(S)` denote the enthalpies of formation of `X`, `Y`, `R` and `S` respectively, the enthalpy of the reaction `X+YtoR+S` is given by
A. `DeltaH_(f)(X)+DeltaH_(f)(Y)`
B. `DeltaH_(f)(R )+DeltaH_(f)(S)`
C. `DeltaH_(f)(X)+DeltaH_(f)(Y)-DeltaH_(f)(R )-DeltaH_(f)(S)`
D. `DeltaH_(f)(R )+DeltaH_(f)(S)-DeltaH_(f)(X)-DeltaH_(f)(Y)`

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Correct Answer - D
`DeltaH=sum DeltaH_(f)(P)-DeltaH_(f)(R )`

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