Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 52

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The dissociation energy of ${CH}_{4} (g)$ is $360 {kcalmol}^{- 1}$ and that of $C_{2} H_{6}$ ( $g$ ) is $620 {kcalmol}^{- 1}$ . The $C - C$ bond energy

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Important Questions on Thermodynamics

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 53

The enthalpy of reaction,
$2 HC \equiv CH + 5 O_{2} \to 4 {CO}_{2} + 2 H_{2} O$
If the bond energies of $C - H, C \equiv C, O = O, C = \bar{U}$ and $O - H$ bonds are $p, q, r, s, t$ respectively

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 54

Using bond energy data, calculate heat of formation of isoprene
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Given $C - H, H - H, C - C, C = C$ and $C (s) \to C (g)$ respectively. as $98.8 kcal, 104 kcal, 83 kcal, 147 kcal, 171 kcal$

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 55

In a flask, colourless

N_{2} O_{4}

is in equilibrium with brown coloured

{NO}_{2}

. At equilibrium, when the flask is heated at

100 ° C

, the brown colour deepens and on cooling, it becomes less coloured. The change in enthalpy

∆ H

, for the system is:

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 1

Consider the given reaction

{PCl}_{5} (g) ⟶ {PCl}_{3} (g) + {Cl}_{2} (g)

If the enthalpy change (i.e.

ΔH

) for the given reaction is

- x J / mol

at

TK

then the value of

ΔU

is

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 2

The heat of combustion of ethene from the given data is
${CH}_{2} = {CH}_{2} (g) + 3 O_{2} (g) ⟶ 2 {CO}_{2} (g) + 2 H_{2} O (I)$

Bond Bond Energy
$C = C xkJ / mol$

$C - H y kJ / mol$

$O = O zkJ / mol$

$C = O akJ / mol$

$O - H bkJ / mol$

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 3

If energy required to dissociate

16 g

of gaseous hydrogen into free atoms is

3488 kJ

at

25 ° C

then the bond energy of

H - H

bond will be

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 4

The correct relation between molar heat capacities

C_{p}

and

C_{v}

is

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Gamma Question Bank for Medical Chemistry>Chapter 6 - Thermodynamics>Assignment>Q 5

Consider the following
The correct relation between $u, v & w$ is

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