Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 134

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If heat of dissociation of ${CHCl}_{2} COOH$ is $0.7$ $kcal / mole$ , $ΔH$ for the reaction ${CHCl}_{2} COOH + KOH ⟶ {CHC}_{2} COOK + H_{2} O$ is:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 135

Enthalpy of neutralisation of

{CH}_{2} COOH

by

NaOH

is

- 50.6

kJ / mol

and the heat of neutralisation of a strong acid with

NaOH

is

- 55.9

kJ / mol

. The value of

ΔH

for the ionisation of

{CH}_{3} COOH

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 136

For which one of the following reaction does the molar enthalpy change of a reaction correspond to lattice energy of

KBr

?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 137

Calculate the lattice energy for the reaction

${Li}^{+} (g) + {Cl}^{-} (g) ⟶ LiCl (s)$

Given that

${ΔH}_{sub} (Li) = 160; {ΔH}_{dss} ({Cl}_{2}) = 244; IP (Li) = 520$ ;

$E_{A} (Cl) = - 365$ and ${ΔH}_{f} (LiCl) = - 400$ (all in $kJ {mole}^{- 1}$ )

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 138

The bond energy

(in kcal {mol}^{-1})

of

C - C

single bond is approximately

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 139

The bond dissociation energy of gaseous

H_{2}, {Cl}_{2}

and

HCl

are

104, 58

and

103 kcal {mol}^{- 1}

respectively. The enthalpy of formation for

HCl

gas will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 140

If enthalpy of dissociation of

{CH}_{4}

(g)

and

C_{2} H_{6}

(g)

into gaseous atoms is

320

and

600

calories, respectively, then bond energy of

C - C

bond is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 141

AB

,

A_{2}

and

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, AB

and

B_{2}

are in the ratio

1 : 1 : 0.5

and enthalpy of formation of

AB

from

A_{2}

and

B_{2}

is

- 100

kJ / {mol}^{- 1}

, what is the bond enthalpy of

A_{2}

?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 142

If at

298 K

the bond energies of

C — H, C — C, C = C

and

H — H

bonds are, respectively,

414, 347, 615 and 435 kJ {mol}^{- 1}

, the value of enthalpy change for the reaction

H_{2} C = {CH}_{2} (g) + H_{2} (g) \to H_{3} C - {CH}_{3} {(g)}_{} at 298 K

will be: