The enthalpy of formation of HI is 30.4 kJ. Which statement is false according to this observat

step 1 The enthalpy of formation of hydrogen iodide is 30 .4 kilojoult. Which statement is false accord

The enthalpy of formation of HI is 30.4 kJ. Which statement...

The enthalpy of formation of $\mathrm{HI}$ is $30.4 \mathrm{~kJ}$. Which statement is false according to this observation? (1) HI is an endothermic compound. (2) For the reaction $\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2 \mathrm{ig}} \rightarrow 2 \mathrm{HI}_{(\mathrm{g}}, \Delta / I=60.8 \mathrm{~kJ}$ (3) HI is a stable compound. (4) HI is an unstable compound.

The enthalpy of formation of $\mathrm{HI}$ is $30.4 \mathrm{~kJ}$. Which statement is false according to this observation?
(1) HI is an endothermic compound.
(2) For the reaction $\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2 \mathrm{ig}} \rightarrow 2 \mathrm{HI}_{(\mathrm{g}}, \Delta / I=60.8 \mathrm{~kJ}$
(3) HI is a stable compound.
(4) HI is an unstable compound.

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Key Concepts

Reaction Enthalpy Calculation

This concept involves determining the overall enthalpy change for a chemical reaction by summing the standard enthalpies of formation of the products and subtracting those of the reactants. It is a crucial tool in understanding how the energy profile of a reaction indicates its favorability and the nature of the reaction process.

Standard Enthalpy of Formation

This concept refers to the enthalpy change when one mole of a compound is formed from its constituent elements in their standard states. It provides a measure of the energy content of a compound relative to its elements, indicating whether energy is absorbed or released during formation.

Endothermic and Exothermic Processes

These terms describe whether a reaction absorbs energy (endothermic) or releases energy (exothermic) during the process. A positive enthalpy of formation, as in an endothermic reaction, signifies that energy is absorbed from the surroundings when the compound is formed.

Thermodynamic Stability

Thermodynamic stability is linked to the energy content of a compound relative to its constituent elements. A compound with a higher (more positive) enthalpy of formation is generally less stable than one with a lower (more negative) enthalpy because it exists at a higher energy level relative to the elements.

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