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Standard XII

Chemistry

Heat of Reaction

Out of the fo...

Question

Out of the four $Δ$ H values needed to calculate a lattice energy using the Born-Haber cycle, the one that is most difficult to measure is:

the heat of sublimation of the metal

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the heat of formation of gaseous atoms of the non-metal

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the ionization energy of the metal

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the electrons affinity of the non-metal

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Solution

The correct option is D the electrons affinity of the non-metal
Electrons affinity of the non-metal is most difficult to measure.

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Similar questions

Q. The correct folrmula of Q by using Born-Haber cycle for the preparation of

M g B r_{2} (s)

will be:
S

=

heat of sublimation of Mg(s)
I

=

ionisation energy of Mg(g)
D

=

dissociation energy of Br

_{2}

(g)
-E

=

electron affinity of Br(g)
-U

=

lattice energy of MgBr

_{2}

(s)
Q

=

heat of formation of MgBr

_{2}

(s)

Q. Calculate the lattice energy of a salt

M X_{(s)}

from the data given below:
Heat of formation of

M X (Δ H) = - 550 kJ/mol

Heat of sublimation of

M (S) = 80 kJ/mol

Heat of dissociation of

X_{2} (D) = 155 kJ/mol

Ionization energy of

M (I) = 347 kJ/mol

Electron affinity of

X (E) = - 343 kJ/mol

The lattice energy of NaCl(s) using the following data will be:

heat of sublimation of $N a (s) = S$

$(I E)_{1}$ of $N a (g) = I$

bond dissociation energy of $C l_{2} (g) = D$

electron affinity of $C l (g) = - E$

heat of formation of

N a C l (s) = - Q

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)}

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}

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}

Enthalpy of sublimation of

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

First ionization energy of

C s = + 375 k J m o l^{- 1}

Enthalpy of dissociation of

O_{2} (g) = 494 k J m o l^{- 1} o f O_{2} m o l e c u l e s

First electron affinity of

O = - 141 k J m o l^{- 1} o f O a t o m s

Second electron affinity of

O = + 845 k J m o l^{- 1} o f O^{1 -} i o n s

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Out of the four ΔH values needed to calculate a lattice energy using the Born-Haber cycle, the one that is most difficult to measure is:

The correct option is D the electrons affinity of the non-metalElectrons affinity of the non-metal is most difficult to measure.

Out of the four $Δ$ H values needed to calculate a lattice energy using the Born-Haber cycle, the one that is most difficult to measure is:

The correct option is D the electrons affinity of the non-metal
Electrons affinity of the non-metal is most difficult to measure.