Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 2

EASY

11th CBSE

IMPORTANT

Earn 100

Calculate the temperature in centigrade when vaporization of water is in equilibrium at one atmospheric pressure. (Enthalpy of vaporization $= 40.63 \times 10^{3} J {mol}^{- 1}; Δ_{vap} S = 108.8 J K^{- 1} {mol}^{- 1}$ ).

Important Questions on Thermodynamics

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 3

Enthalpy change (

Δ_{vap} H

) for the transition of liquid water to steam at

100 ° C

is

40.8 kJ {mol}^{- 1}

. Calculate the entropy change for the process.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 4

Ethanol boils at

78.4 ° C

and the standard enthalpy of vaporization of ethanol is

42.4 kJ {mol}^{- 1}

. Calculate the entropy of vaporisation of ethanol.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 5

What is the entropy change for conversion of one gram of ice to water at

273 K

and one atmospheric pressure (

Δ_{fus} H = 6.025 kJ {mol}^{- 1}

)?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 6

The entropy change for the vaporisation of water is

109 J K^{- 1} {mol}^{- 1}

. Calculate the enthalpy Change for the vaporisation of water at

373 K

.

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 7

Calculate the entropy change for the conversion of

2

moles of liquid water at

373 K

to vapours, if

Δ_{vap} H

is

37.3 kJ {mol}^{- 1}

.

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE>Q 8

The enthalpy of vaporisation of benzene (

C_{6} H_{6}

) is

30.8 kJ {mol}^{- 1}

at its boiling point (

80.1 ° C

). Calculate the entropy change in going from
(i) liquid to vapour and (ii) vapour to liquid at

80.1 ° C

.

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE

10 kg

of cold water at

2 ° C

absorbs

50 J

of heat from the surroundings which were at a temperature of

37 ° C

. What is the entropy change of the system? Assume the change in temperature of the water and the surroundings to be negligible.

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>PROBLEMS FOR PRACTICE

10 kg

of cold water at

2 ° C

absorbs

50 J

of heat from the surroundings which were at a temperature of

37 ° C

. What is the entropy change of the surroundings? Assume the change in temperature of the water and the surroundings to be negligible.