If you are given Avogadro's number of atoms of a gas 'X'. If half of the atoms are converted into X+(g)
by energy AH. The IE of X per mole is
(1)2ΔH
(2) 2ΔH/NA
(3)ΔΗ
(4)ΔΗ/NA
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Explanation:
Given no. of atoms = Avogadro's no. of atoms = N
A
=6.023×10
23
Given that
2
N
A
atoms are ionized, i.e.,
Ionization energy of
2
N
A
atoms of gas X = ΔH
∴ Ionization energy of 1 atom of gas X =
(
2
N
A
)
ΔH
=
N
A
2.ΔH
Hence, Ionisation energy of gas X is
N
A
2.ΔH
.
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