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

Options

A. `Delta_(f)H (X) + Delta _(f) H (Y)`
B. `Delta _(f)H (R )+ Delta_(f) H(S)`
C. `Delta_(f)H (X) + Delta_(f) H(Y) -Delta _(f)H(R )-Delta _(f) H(S)`
D. `Delta_(f)H(S) + Delta _(f)H (R )-Delta_(f)H(X)-Delta_(f)H(Y)`

Answer

D

Explanation

`Delta H ("reaction") = Sigma Delta _(f)H^(0) ("product") - Sigma Delta _(f)H^(0)("reactant")`