The formation of an oxide ion from Oxygen atom takes place as shown below. This two-step process is unfavourable, even though O 2 - is iso-electronic with Neon, due to the fact that O ( g ) + e - ⟶ O ( g ) - ; ΔH f ° = - 141 kJ . mol - 1 O ( g ) - + e - ⟶ O ( g ) 2 - ; ΔH f 0 = + 780 kJ . mol - 1

Electron repulsion out-weighs the stability gained by achieving noble gas configuration.

Addition of electron in oxygen results in larger size of the ion.

Oxygen is more electro negative.

O - ion has comparatively smaller size than oxygen atom.

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A certain reaction, for which the enthalpy change is $24.85 kJ,$ is at equilibrium at $82 ° C .$ Find the value of $∆ S$ for this reaction.

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Important Questions on Thermodynamics

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET Medical 2019 (24-Apr Shift-1)>Q 1

Identify the correct set of intensive properties from the following

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET 2020 (24-Sep Shift-1)>Q 2

Which of the following can be considered as the definition/principle of energy?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET Medical 2021 (6-Sep Afternoon)>Q 3

A system undergoes a process in which

ΔU = + 300 J

while absorbing

400 J

of heat energy and undergoing an expansion against

0.5

bar. What is the change in volume (in

L) ?

MEDIUM

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET - 3 Sep 2021 Afternoon>Q 4

When a gas is allowed to expand in a well-insulated container, against a constant external pressure of

5

atm, from an initial value of

10 L

to a final volume of

15 L,

find the change in the internal energy

(ΔU)

of the gas.

HARD

AP EAPCET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET Medical 2018 (22-Apr Shift-1)>Q 5

The enthalpies of formation of

{CO}_{(g)}, {CO}_{2 (g)}

and

N_{2} O_{(g)}

are -110,-393 and

81 kJ {mol}^{- 1}

respectively. If the enthalpy of reaction

(Δ_{r} H)

for

N_{2} O_{4 (g)} + 3 {CO}_{(g)} \to N_{2} O_{(g)} + 3 {CO}_{2 (g)}

- 778 kJ,

the enthalpy of formation of

N_{2} O_{4} (g)

{kJmol}^{- 1}

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET Medical 2021 (6-Sep Forenoon)>Q 6

Given that a person inhales

640 g

of oxygen per day, assuming all the inhaled

O_{2}

is utilized in converting sugar (sucrose) to

{CO}_{2}

and

H_{2} O .

Find the amount of heat evolved. [

{ΔH}_{combustion}

of sucrose is

- 5645 kJ . {mol}^{- 1}

]

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET Medical 2021 (6-Sep Afternoon)>Q 7

Find the $ΔH °$ for the reaction $H_{2} O_{(g)} + {Br}_{2}_{(g)} ⟶ {HBr}_{(g)} + {HOBr}_{(g)}$ using:
Bond energy of $O - H$ bond in Water $= 463 kJ$
Bond energy of $Br - Br$ bond in ${Br}_{2} = 192 kJ$
Bond energy of $O - Br$ bond in $HOBr = 234 kJ$
Bond energy of $H - Br$ bond in $HBr = 364 kJ$

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 6 - Thermodynamics>AP EAPCET - 3 Sep 2021 Forenoon>Q 8

If the enthalpy of combustion of

{CH}_{4}

and

{CH}_{3} OH

are

' x'

and

' y'

respectively, then find the enthalpy of the reaction

{CH}_{4} + \frac{1}{2} O_{2} ⟶ {CH}_{3} OH

A certain reaction, for which the enthalpy change is 24.85 kJ, is at equilibrium at 82°C. Find the value of ∆S for this reaction.

Important Questions on Thermodynamics

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A certain reaction, for which the enthalpy change is $24.85 kJ,$ is at equilibrium at $82 ° C .$ Find the value of $∆ S$ for this reaction.