First slide

Hydrogen

Question

The ionisation energy of hydrogen is

Easy

A

1312 KJ mole^–1
B

520 KJ mole^–1
C

495 KJ mol^–1
D

1681 KJ mol^–1

Solution

The ionisation energy of hydrogen is +13.6ev/atom
1ev - 1.602 x 10^-19J
13.6ev - ??
13.6 x 1.602 x 10¹⁹ J
= 21.78 x 10^-19J/atom
1 atom energy - 21.78 x 10^-19 J
[1 mole] 6.023 x 10²³ atoms energy - ?? J
= 6.23 x 10²³ x 21.78 x 10^-19 J/mole
= 131.224 x 10⁴ J/mole
[I.E]_H = 1312 KJ/mole [ $\because$ 1J = 10^-3 KJ]

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