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 .

E M B I B E

Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 65

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IMPORTANT

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From the following bond energies:
$H - H$ bond energy: $431.37 {kJmol}^{- 1}$
$C = C$ bond energy: $606.10 {kJmol}^{- 1}$
$C - C$ bond energy: $336.49 {kJmol}^{- 1}$
$C - H$ bond energy: $410.50 {kJmol}^{- 1}$
Enthalpy for the reaction,

Will be:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 66

The values of

ΔH

and

ΔS

for the reaction,

C_{(g raphite)} + {CO}_{2 (g)} \to 2 {CO}_{(g)}

are

170 kJ

and

170 {JK}^{- 1}

, respectively. This reaction will be spontaneous at

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 67

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 68

For vaporization of water at

1

atmospheric pressure, the values of

ΔH

and

ΔS

are

40.63

{kJmol}^{- 1}

and

108.8 {JK}^{- 1} {mol}^{- 1},

respectively. The temperature when Gibbs energy change

(ΔG)

for this transformation will be zero, is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 69

The following two reactions are known: ${Fe}_{2} {O_{3}}_{(s)} + 3 {CO}_{(g)} \to 2 {Fe}_{(s)} + 3 {CO}_{2}_{(g)}; ∆ H = - 26.8 kJ$ and ${FeO}_{(s)} + {CO}_{(g)} \to {Fe}_{(s)} + {CO}_{2}_{(g)}; ∆ H = - 16.5 kJ$ . The value of $∆ H$ for the following reaction ${Fe}_{2} {O_{3}}_{(s)} + {CO}_{(g)} \to 2 {FeO}_{(s)} + {CO}_{2}_{(g)}$ is