If H2 lg 1 →2 H(g) ; Δl I=104 kea then heat of atomiza- tion of hydrogen is (1) 52 keal (2) 104

step 1 If hydrogen gas is converted into two atoms of hydrogen, delta H is equal to 104 kilo cal. Then

If H2 lg 1 →2 H(g) ; Δl I=104 kea then heat of atomiza- tion...

If $\mathrm{H}_{2 \mathrm{lg} 1} \rightarrow 2 \mathrm{H}(\mathrm{g}) ; \Delta l I=104 \mathrm{kea}$ then heat of atomiza-
tion of hydrogen is
(1) 52 keal
(2) $104 \mathrm{kcal}$
(3) $208 \mathrm{kcal}$
(4) None of these

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Key Concepts

Mole Concept

The mole concept is fundamental in stoichiometry and thermodynamics, as it provides a bridge between the macroscopic measurement of substances and the number of particles present. In the context of bond energies, it allows for the quantification of energy per mole of bonds or atoms, enabling the calculation of energy required for reactions such as atomization.

Heat of Atomization

Heat of atomization refers to the total energy required to convert one mole of a substance into its individual gaseous atoms. For elements that naturally exist as molecules (like diatomic molecules), this process involves breaking all the chemical bonds to yield separate atoms, and the heat of atomization is a direct measure of the bond energies present in the molecule.

Bond Dissociation Energy

Bond dissociation energy is the amount of energy needed to break one mole of specific bonds in the gaseous phase, resulting in separate atoms or radicals. It is a critical parameter in calculating the energy changes during chemical reactions, particularly for diatomic molecules where breaking the single bond results in isolated atoms.

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