The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at 25 ° C is

298 × 10 7 × 8 . 31 × 2 . 303 log 2 .

2 . 303 × 298 × 0 . 082 log 2 .

2 . 303 × 298 × 0 . 082 log 0 . 5 .

8 . 31 × 10 7 × 298 × 2 . 303 log 0 . 5 .

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Which of the following equation gives the values of heat of formation $({ΔH}_{f}^{0})$ ?

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 27

From the following data of $ΔH$ , of the following reactions,

$C (s) + \frac{1}{2} O_{2} (g) ⟶ CO (g)$ ; $ΔH = - 110$ $kJ$

$C (s) + H_{2} O (g) \to CO (g) + H_{2} (g)$ ; $ΔH = 132$ $kJ$

What is the molar ratio of steam and oxygen, which on being passed over excess coke, does not lead to the rise in temperature?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 28

Given,

H_{2} (g) + {Br}_{2} (g) ⟶ 2 HBr (g), {ΔH}_{1}^{0}

and the standard enthalpy of condensation of bromine is

{ΔH}_{2}^{0}

, the standard enthalpy of formation of

HBr

25 ° C

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 29

The standard enthalpies of formation of

{CO}_{2} (g), H_{2} O (l)

and glucose

(s)

25 ° C

are,

- 400

kJ / mol

- 300

kJ / mol

and

- 1300

kJ / mol

, respectively. The standard enthalpy of combustion per gram of glucose at

25 ° C

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 30

When a certain amount of ethylene was combusted,

5644 kJ

heat was evolved. If heat of combustion of ethylene is

1411 kJ,

the volume of

O_{2}

(at NTP) that entered into the reaction is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 31

The heat of combustion of sucrose

(C_{12} H_{22} O_{11})

1710

kcal / mol

. How much of heat will be liberated, when

17.1

g

of sucrose is burnt?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 32

Enthalpy of polymerisation of ethylene, as represented by the reaction,

{nCH}_{2} = {CH}_{2} ⟶ {(- {CH}_{2} - {CH}_{2} -)}_{n}

- 100 kJ {mol}^{- 1}

of ethylene. Given bond enthalpy of

C = C

bond is

600 kJ {mol}^{- 1},

enthalpy of

C - C

bond (in

kJ {mol}^{- 1}

) will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 33

The average energy required to break a

P - P

bond in

P_{4} (s)

into gaseous atoms is

53.2

kcal {mol}^{- 1}

. The bond dissociation energy of

H_{2} (g)

104.2

kcal {mol}^{- 1}

;

{ΔH}_{1}^{0}

{PH}_{3} (g)

from

P_{4} (s)

5.5

kcal {mol}^{- 1}

. The

P - H

bond energy in

kcal {mol}^{- 1}

Is [Neglect presence of Van der Waals forces in

P_{4} (s)

]

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 2>Q 35

Which of the following statements about the spontaneous reaction occurring in a galvanic cell is always true?

Which of the following equation gives the values of heat of formation ΔHf0?

Important Questions on Thermodynamics

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Which of the following equation gives the values of heat of formation $({ΔH}_{f}^{0})$ ?