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Ionization Enthalpy

Energy involv...

Question

Energy involved to ionise $O_{2} (g)$ to $O^{2 -} (g)$ is $639 {kJ mol}^{- 1}$ . If the ionisation enthalpy of $O^{-} (g)$ is $141 {kJ mol}^{- 1}$ . The second electron gain enthalpy of oxygen would be:

A

- 780 {kJ mol}^{- 1}

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B

780 {kJ mol}^{- 1}

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C

498 {kJ mol}^{- 1}

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D

- 498 {kJ mol}^{- 1}

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Solution

The correct option is B $780 {kJ mol}^{- 1}$
Given:
$O (g) + 2 e^{-} \to O^{2 -} (g); Δ H = 639 {kJ mol}^{- 1} . . . (i)$
$O^{-} (g) \to O (g) + e^{-}; Δ H = 141 {kJ mol}^{- 1} . . . (i i)$

Adding equation (i) and (ii), we get
$O^{-} (g) + e^{-} \to O^{2 -} (g); Δ H = 780 {kJ mol}^{- 1} . . . (i i i)$

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Similar questions

Q. Energy involved to ionise

O_{2} (g)

O^{2 -} (g)

639 {kJ mol}^{- 1}

. If the ionisation enthalpy of

O^{-} (g)

141 {kJ mol}^{- 1}

. The second electron gain enthalpy of oxygen would be:

Q. Ionisation of energy of

F^{-}

320 {kJ mol}^{- 1}

. The electron gain enthalpy of fluorine would be

Q. Calculate the lattice enthalpy of

K C l

from the following data at standard states-
Enthalpy of sublimation of

K = 89 k J m o l^{- 1}

Enthalpy of dissociation of

C l_{2} = 244 k J m o l^{- 1}

Ionisation energy of

K = 425 k J m o l^{- 1}

Electron gain enthalpy of

C l = - 355 k J m o l^{- 1}

Enthalpy of formation of

K C l = - 438 k J m o l^{- 1}

Q. Calculate the enthalpy of formation of

M g F_{2}

from thefollowing data-
Enthalpy of sublimation for

M g (s) \to M g (g) = 146.4 k J m o l^{- 1}

Enthalpy of dissociation of

F_{2} (g) \to 2 F (g) = 155.8 k J m o l^{- 1}

Ionisation energy of

M g (g) \to M g^{2 +} (g) = 2186 k J m o l^{- 1}

Electron gain enthalpy of

2 F \to 2 F^{- 1} = 2 \times - 322.6 = - 645.2 k J m o l^{- 1}

Lattice enthalpy of

M g F_{2} = - 2922.5 k J m o l^{- 1}

Q. If X is the lattice enthalpy of

C a C l_{2}

, find X. Given that the enthalpy of
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C a (s)

121 k J m o l^{- 1}

(ii) Dissociation of

C l_{2} (g)

2 C l (g)

242.8 k J m o l^{- 1}

(iii) Ionization of

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C a^{2 +} (g)

2422 k J m o l^{- 1}

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C l (g)

C l^{- 1} (g)

- 355 k J m o l^{- 1}

△_{f} H

- 795 k J m o l^{- 1}

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Ionization Enthalpy

Standard XII Chemistry

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