Which of the following reaction defines ΔHf^6 ? (a) C (diamond )+O2( g) ⟶CO2( g) (b) 1 / 2 H2( g

step 1 So here the concept that is required to know the answer that is regarding the heat of formation.

Which of the following reaction defines ΔHf^6 ? (a) C...

Which of the following reaction defines $\Delta \mathrm{H}_{\mathrm{f}}^{6} ?$ (a) $\mathrm{C}$ (diamond $)+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})$ (b) $1 / 2 \mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{~F}_{2}(\mathrm{~g}) \longrightarrow \mathrm{HF}(\mathrm{g})$ (c) $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})$ (d) $\mathrm{CO}(\mathrm{g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})$

Which of the following reaction defines $\Delta \mathrm{H}_{\mathrm{f}}^{6} ?$
(a) $\mathrm{C}$ (diamond $)+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})$
(b) $1 / 2 \mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{~F}_{2}(\mathrm{~g}) \longrightarrow \mathrm{HF}(\mathrm{g})$
(c) $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})$
(d) $\mathrm{CO}(\mathrm{g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g})$

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Key Concepts

Standard States

The concept of standard states refers to the physical form in which a substance is most stable under standard conditions (usually 1 atm pressure and 25°C). For elements, this is the form in which they naturally occur, such as O2(g) for oxygen or graphite for carbon, and is essential when defining formation reactions and calculating standard enthalpies of formation.

Formation Reaction

A formation reaction is the chemical process in which one mole of a compound is produced from its constituent elements all in their standard states. It serves as the defining reaction for the standard enthalpy of formation and, by convention, involves forming the compound in a way that its formation enthalpy can be directly measured and compared.

Standard Enthalpy of Formation

Standard enthalpy of formation (?H°f) is defined as the enthalpy change when one mole of a compound is formed from its elements in their most stable forms (standard states) under standard conditions, typically 1 atm and 25°C. This value provides a measure of the energy required to create a compound from its basic elements and is a crucial reference in thermochemistry.

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