The enthalpy change for chemical reaction is denoted aas `DeltaH^(Theta)` and `DeltaH^(Theta) = H_(P)^(Theta) - H_(R)^(Theta)`. The relation between enthalpy and internal enegry is expressed by equation:
`DeltaH = DeltaU +DeltanRT`
where `DeltaU =` change in internal enegry `Deltan =` change in number of moles, `R =` gas constant.
Which of the following equations corresponds to the definition of enthalpy of formation at `298K`?

Options

A. `C("graphite") +2H_(2)(g) +(1)/(2)O_(2)(l) rarr CH_(3) OH(g)`
B. `C("diamond") +2H_(2)(g)+(1)/(2)O_(2)(g) rarr CH_(3)OH(l)`
C. `2C("graphite") +4H_(2)(g) +O_(2)(g) rarr 2CH_(3)OH(l)`
D. `C("graphite") +2H_(2)(g) +(1)/(2)O_(2)(g) rarr CH_(3)OH(l)`

Explanation

Graphite is a standard state of carbon and `CH_(3)OH` in liquid state is also standard state.