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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For the chemical reaction $X ⇌ Y$ , the standard reaction Gibbs energy depends on temperature $T$ (in $K$ ) as $Δ_{r} G °$ (in $kJ {mol}^{- 1}$ ) $= 120 - \frac{3}{8} T$ . The major component of the reaction mixture $T$ is:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 108

The standard reaction Gibbs energy for a chemical reaction at an absolute temperature

T

is given by

ΔG ° = A - BT

where

A

and

B

are non-zero constants. Which of the following is

TRUE

about this reaction?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 109

The reaction,

MgO (s) + C (s) \to Mg (s) + CO (g)

, for which

ΔrH ° = + 491.1 kJ {mol}^{- 1}

and

Δr ° = 198.0 {JK}^{- 1} {mol}^{- 1}

, is not feasible at

298 K

. Temperature above which reaction will be feasible is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 110

Given:

(i) $C (graphite) + O_{2} (g) \to {CO}_{2} (g); {ΔrH}^{-} = x kJ {mol}^{- 1}$

(ii) $C (graphite) + \frac{1}{2} O_{2} (g) \to {CO}_{2} (g); {ΔrH}^{-} = y kJ {mol}^{- 1}$

(iii) $CO (g) + \frac{1}{2} O_{2} (g) \to {CO}_{2} (g); {ΔrH}^{-} = z kJ {mol}^{- 1}$

Based on the above thermochemical equations, find out which one of the following algebraic relationship is correct?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 1

1 mole of an ideal gas

A (C_{v, m} = 3 R)

and 2 mole of an ideal gas B are

(C_{v, m} = \frac{3}{2} R)

taken in a container and expanded reversible and adiabatically from 1 litre to 4 litre starting from initial temperature of 320K.

∆ E

for the process is :

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 2

50 litres

of a certain liquid is confined in a piston system at the external pressure

100 atm .

This pressure is suddenly released and liquid is expanded against the constant atmospheric pressure, volume of the liquid increases by

1 litre

and the final pressure on the liquid is

10 atm .

Find the work done.

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 3

1 mole

of an ideal gas

C_{p} = \frac{5}{2} R

expanded isothermally at

300 K

until its volume is tripled.If expansion is carried out freely

(P_{ex} = 0),

then

ΔS

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 4

Two moles of a monoatomic ideal gas is expanded irreversibly and isothermally at

T

Kelvin until its volume is doubled and

q

Joules heat is absorbed from surroundings.

{ΔS}_{total} (J / K)

(system

+

surrounding) is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 5

What is the change in entropy when 2.5 mol of water is heated from

27 ° C

87 ° C

? Assume that the heat capacity is constant.

[C_{p, m} (H_{2} O) = 4.2 J / g . K] (l n (1.2) = 0.18)

For the chemical reaction X⇌Y, the standard reaction Gibbs energy depends on temperature T (in K) as ΔrG° (in kJ mol-1)=120-38T. The major component of the reaction mixture T is:

Important Questions on Thermodynamics

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For the chemical reaction $X ⇌ Y$ , the standard reaction Gibbs energy depends on temperature $T$ (in $K$ ) as $Δ_{r} G °$ (in $kJ {mol}^{- 1}$ ) $= 120 - \frac{3}{8} T$ . The major component of the reaction mixture $T$ is: