Which of the following equations respresents standard heat of formation of `CH_(4)` ?

Which of the following equations represents standard heat of combustion of CH_(4) ?

Which of the following equation represents standard heat of formation of ethanol?

Which of the following equation represents standard heat of formation of methane ?

Define standard heat of formation.

Which of the following equations represents standard enthalpy of formation of methane?

Which of the following represents standard heat of formation of water?

Which of the following equations correctly represents the standard heat of formation (Delta H_f^@) of methane?