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Covalent Bond vs Ionic Bond

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Question

Calculate the electron affinity of oxygen atom in gaining two electrons to give the oxide ion $O^{2 -}$ from the following data.
Standard heat of formation of $M g O_{(s)} = - 600 k J m o l^{- 1}$
Lattice energy of $M g O_{(s)} = - 3860 k J m o l^{- 1}$
lonization energy of $M g_{(g)}$ to give $M g^{2 +}$ = +2170 $k J m o l^{- 1}$
Dissociation energy of $O_{2 (g)}$ = +494 $k J m o l^{- 1}$
Heat of sublimation of $M g_{(s)}$ = +150 $k J m o l^{- 1}$

A

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

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B

+ 493 k J m o l^{- 1}

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C

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

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D

+ 693 k J m o l^{- 1}

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Solution

The correct option is D $+ 693 k J m o l^{- 1}$
Given, $Δ_{f} H_{M g O} = - 600 k J m o l^{- 1}$
$M g_{(s)} \to M g_{(g)} Δ_{s} H = + 150 k J m o l^{- 1}$
$M g_{(g)} \to M g_{(g)}^{2 +} I . E . = + 2170 k J m o l^{- 1}$
$\frac{1}{2} O_{2_{(} g)} \to O_{(g)} B . E . = + 494 k J m o l^{- 1}$ $Lattice energy of M g O_{(s)} = - 3860 k J m o l^{- 1}$
$Δ_{f} H_{M g O} = Δ_{s} H + I . E . + \frac{1}{2} B . E . + E . A . + Lattice energy$
$- 600 = 150 + 2170 + 247 + E . A . - 3860$
$E . A . = - 600 - 150 - 2170 - 247 + 3860$
$∴ E A = + 693 k J m o l^{- 1}$

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Similar questions

Q. Calculate the electron affinity of oxygen atom in gaining two electrons to give the oxide ion

O^{- 2}

from the following data.
Standard heat of formation of

M g O_{(s)} = - 600 k J m o l^{- 1}

Lattice energy of

M g O_{(s)} = - 3860 k J m o l^{- 1}

lonization energy of

M g_{(g)}

M g^{+ 2}

k J m o l^{- 1}

Dissociation energy of

O_{2 (g)}

k J m o l^{- 1}

Heat of sublimation of

M g_{(s)}

k J m o l^{- 1}

Q. Use the following data to calculate second electron affinity of oxygen for the process

O^{-} (g) + e^{-} (g) \to O^{2 -} (g)

.
Heat of sublimation of

M g (s) = 147.7 kJ/mol

Ionisation energy of

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M g^{2 +} (g) = 2189 kJ/mol

Bond dissociation energy for

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= 498.4 kJ/mol

First electron affinity of

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Heat formation of

M g O (s) = - 601.7 kJ/mol

lattice energy of

M g O = - 3791 kJ/mol

Q. Use the following data to calculate second electron affinity of oxygen for the process

O^{-} (g) + e^{-} (g) \to O^{2 -} (g)

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Heat of sublimation of

M g (s) = 147.7 k J / m o l

Ionisation energy of

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M g^{2 +} (g) = 2189 k J / m o l

Bond dissociation energy for

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= 498.4 k J / m o l

First electron affinity of

O (g) = - 141 k J / m o l

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M g O (s) = - 601.7 k J / m o l

lattice energy of

M g O = - 3791 k J / m o l

Q. Use the following data to calculate the lattice energy of cesium oxide.
Enthalpy of formation of cesium oxide =

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Enthalpy of sublimation of

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First ionization energy of

C s = + 375 k J / m o l

Enthalpy of dissociation of

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First electron affinity of

O = - 141 k J / m o l

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Second electron affinity of

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Q. Use the following data to calculate the lattice energy of caesium oxide.
Enthalpy of formation of caesium oxide =

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

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C s = + 78 k J m o l^{- 1}

First ionization energy of

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Enthalpy of dissociation of

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First electron affinity of

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Covalent Bond vs Ionic Bond

Standard XI Chemistry

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