Standard enthalpy of vaporization $∆_{vap} H^{0}$ for water at 100⁰C is 40.66 Kj mol^-1. The internal energy of vaporization of water at 100⁰C (in kJ mol^-1) is
(Assume water vapour to behave like an ideal gas).

1. +37.56

1. -43.76

3. +43.76

4. +40.66

Subtopic: Enthalpy & Internal energy |

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Which of the following is the correct option for free expansion of an ideal gas under adiabatic condition?
1.   $q \neq 0, ∆ T = 0, W = 0$
2.   $q = 0, ∆ T = 0, W = 0$
3.   $q = 0, ∆ T < 0, W \neq 0$
4.   $q = 0, ∆ T \neq 0, W = 0$

Subtopic: 2nd & 3rd Law of Thermodynamics |

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Given the following reaction:
4H(g)→ 2H₂ (g)
The enthalpy change for the reaction is -869.6 kJ. The dissociation energy of the H-H bond is -
1. -869.6 kJ
2. +434.8kJ
3. +217.4kJ
4. -434.8 kJ

Subtopic: Enthalpy & Internal energy |

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Standard entropies of X₂, Y₂ and XY₃ are 60, 40 and 50JK^-1mol^-1 respectively. For the reaction
$\frac{1}{2} X_{2} + \frac{3}{2} Y_{2} ⇋ {XY}_{3}; ∆ H = - 30 kJ$ to be at equilibrium, the temperature should be

1. 750 K

2. 1000 K

3. 1250 K

4. 500 K

Subtopic: Gibbs Energy Change |

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From the following bond energies :

H—H bond energy: 431.37 kJ mol^-1
C=C bond energy: 606.10 kJ mol^-1
C—C bond energy: 336.49 kJ mol^-1
C—H bond energy: 410.50 kJ mol^-1

Enthalpy for the reaction,

will be

1. 1523.6 kJ mol^-1

2. -243.6 kJ mol^-1

3. -120.0 kJ mol^-1

4. 553.0 kJ mol^-1

Subtopic: Thermochemistry |

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The values of ΔH and ΔS for the reaction, C_(graphite) + CO₂(g)→2CO(g) are 170 kJ and 170 JK^-1, respectively. This reaction will be spontaneous at
1. 710 K
2. 910 K
3. 1110 K
4. 510 K

Subtopic: Gibbs Energy Change |

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Which of the following are not state functions?
(I) q + W
(II) q
(III) W
(IV) H - TS

1. (I) and (IV)

2. (II), (III) and (IV)

3. (I), (II) and (III)

4. (II) and (III)

Subtopic: Gibbs Energy Change |

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For the gas phase reaction,

{PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)

which of the following conditions are correct?

1. ΔH = 0 and ΔS < 0

2. ΔH > 0 and ΔS > 0

3. ΔH < 0 and ΔS < 0

4. ΔH > 0 and ΔS < 0

Subtopic: Gibbs Energy Change |

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The standard free energies of formation(in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H₂O(l), CO₂(g) and pentane (g), respectively. The value of E_cell for the pentane-oxygen fuel cell is:

1. 1.968 V
2. 2.0968 V
3. 1.0968 V
4. 0.0968 V

Subtopic: Gibbs Energy Change |

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Bond dissociation enthalpy of H₂, Cl₂ and HCl are 434, 242 and 431 kJ mol¹ respectively. Enthalpy of formation of HCl is

1. 93 kJ mol^-1
2. - 245 kJ mol^-1
3. -93 kJ mol^-1
4. 245 kJ mol^-1

Subtopic: Thermochemistry |

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Select Chapter Topics:

Thermodynamics' Properties and process

Classification of System, Extensive & Intensive Properties

Enthalpy & Internal energy

Cp & Cv

First Law of Thermodynamics

Thermochemistry

Hess's Law

2nd & 3rd Law of Thermodynamics

Spontaneity & Entropy

Gibbs Energy Change

Standard enthalpy of vaporization $∆_{vap} H^{0}$ for water at 100⁰C is 40.66 Kj mol^-1. The internal energy of vaporization of water at 100⁰C (in kJ mol^-1) is
(Assume water vapour to behave like an ideal gas).

1. +37.56

1. -43.76

3. +43.76

4. +40.66

Select Chapter Topics:

Thermodynamics' Properties and process

Classification of System, Extensive & Intensive Properties

Enthalpy & Internal energy

Cp & Cv

First Law of Thermodynamics

Thermochemistry

Hess's Law

2nd & 3rd Law of Thermodynamics

Spontaneity & Entropy

Gibbs Energy Change

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Select Chapter Topics:

Thermodynamics' Properties and process

Classification of System, Extensive & Intensive Properties

Enthalpy & Internal energy

Cp & Cv

First Law of Thermodynamics

Thermochemistry

Hess's Law

2nd & 3rd Law of Thermodynamics

Spontaneity & Entropy

Gibbs Energy Change

Standard enthalpy of vaporization ∆vapH0for water at 1000C is 40.66 Kj mol-1. The internal energy of vaporization of water at 1000C (in kJ mol-1) is (Assume water vapour to behave like an ideal gas). 1. +37.56 1. -43.76 3. +43.76 4. +40.66

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Select Chapter Topics:

Thermodynamics' Properties and process

Classification of System, Extensive & Intensive Properties

Enthalpy & Internal energy

Cp & Cv

First Law of Thermodynamics

Thermochemistry

Hess's Law

2nd & 3rd Law of Thermodynamics

Spontaneity & Entropy

Gibbs Energy Change

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions

Standard enthalpy of vaporization $∆_{vap} H^{0}$ for water at 100⁰C is 40.66 Kj mol^-1. The internal energy of vaporization of water at 100⁰C (in kJ mol^-1) is
(Assume water vapour to behave like an ideal gas).

1. +37.56

1. -43.76

3. +43.76

4. +40.66