The wrong statement among the following is (1) The heat...

The wrong statement among the following is (1) The heat change for the reaction $\mathrm{II}_{2} \mathrm{O}(1) \rightarrow$ $\mathrm{II}_{2} \mathrm{O}(\mathrm{g})$ is known as heat of vapourisation. (2) The heat change in the reaction $\mathrm{C}(\mathrm{s})+2 \mathrm{~S}(\mathrm{~s}) \rightarrow$ $\mathrm{CS}_{2}$ (1) is called heat of formation of $\mathrm{CS}_{2}$. (3) The standard heat cnthalpy of diamond is zero. (4) The enthalpy change $\mathrm{C}_{(\mathrm{s})} \rightarrow \mathrm{C}_{(\mathrm{g})}$ is known as cnthalpy of sublimation.

The wrong statement among the following is
(1) The heat change for the reaction $\mathrm{II}_{2} \mathrm{O}(1) \rightarrow$ $\mathrm{II}_{2} \mathrm{O}(\mathrm{g})$ is known as heat of vapourisation.
(2) The heat change in the reaction $\mathrm{C}(\mathrm{s})+2 \mathrm{~S}(\mathrm{~s}) \rightarrow$
$\mathrm{CS}_{2}$ (1) is called heat of formation of $\mathrm{CS}_{2}$.
(3) The standard heat cnthalpy of diamond is zero.
(4) The enthalpy change $\mathrm{C}_{(\mathrm{s})} \rightarrow \mathrm{C}_{(\mathrm{g})}$ is known as cnthalpy of sublimation.

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Key Concepts

Heat of Vaporisation

This is the amount of energy required to convert one mole of a substance from its liquid state to vapor at a constant temperature and pressure. It is a common thermodynamic quantity used in understanding phase transitions and the energy involved in changing states of matter.

Heat of Formation

This is defined as the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. It serves as a fundamental reference point for thermodynamic calculations in chemistry and is essential for calculating reaction energetics.

Standard State

The standard state refers to the physical condition of a substance (e.g., temperature, pressure, and form) under which its thermodynamic properties are defined, typically at 1 bar pressure and a specified temperature, with the most stable form of an element considered to have a defined enthalpy of zero.

Enthalpy of Sublimation

This is the energy change associated with the direct transition of a substance from the solid phase to the gaseous phase without passing through an intermediate liquid phase. It is a key concept in understanding phase transitions involving solids and gases.

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