The first ionisation energies of hydrogen-like ions are often expressed per mole for…

CHEMISTRY · Subjective · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

The first ionisation energies of hydrogen-like ions are often expressed per mole for chemical use. (a) Calculate the ionisation energy of a ground-state He

^{+}

ion in joules. (b) Convert this energy to

\text{kJ mol}^{-1}

. (c) How many times larger is the molar ionisation energy of He

^{+}

compared to that of H? Use

N_{A}=6.02\times10^{23}\,\text{mol}^{-1}

1\,\text{eV}=1.6\times10^{-19}\,\text{J}

and

E_{1}=-13.6\,\text{eV}

for hydrogen.

Related theory

Atomic Structure
Bohr's atomic model
Structure of Atom
Bohr's Model of Atom

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