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The standard enthalpy change for a reaction forming a compound from its elements in their standard states is the enthalpy of formation (Δf H°) multiplied by the moles formed. For 2NH₃, Δ H = 2 × Δf H° (NH₃).
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Enthalpy Changes - Reaction Formation Combustion and Hess's Law
298K and 1 atm is the scientifically accurate answer to this question. Within the study of Kinetics and Thermodynamic, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of 298K and 1 atm directly address what is being asked. Among the other options, 273K and 1 atm, 310K and 1 atm, and 350K and 2 atm do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Campbell Biology, Urry et al., 12th Ed.
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