Which of the following equations corresponds to the enthalpy of combustion at `298K`?

Which of the following equations corresponds to the definition of enthalpy of formation at 298K ?

Which of the following equations corresponds to the definition of enthalpy of formation at 298 K?

Which of the following equations corresponds to the definition of enthalpy of formation at 298 K?

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 ?

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 energy is expressed by equation: DeltaH = DeltaU +DeltanRT where DeltaU = change in internal energy Deltan = change in number of moles, R = gas constant. Which of the following equations corresponds to the definition of enthalpy of formation at 298K ?

Which of following equations does not correspond to the standard enthalpy of atomization?

Which of the following reaction corresponds with the definition of standard enthalpy of combustion?