Change in enthalpy for reaction, 2H2O2(l)$\to$ 2H2O(l) + O2(g) If the heat of formation of H2O2(l) and H2O(l) are -188 and -286 kJ/mol respectively is -           1. -196 kJ/mol              2. + 196 kJ/mol 3. +948 kJ/mol              4. -948 kJ/mol

Subtopic:  Enthalpy & Internal energy |
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One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K)$\to$(4.0 atm, 5.0 L, 245 K) with a change in internal energy, $∆$U = 30.0 L atm. The change in enthalpy ($∆$H) of the process in L atm is:

1. 40.0

2. 42.3

3. 44.0

4. not defined, because pressure is not constant

Subtopic:  First Law of Thermodynamics |
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At absolute zero, the entropy of a perfect crystal is zero. This is........... of thermodynamics.

1. The first law

2. Second law

3. Third law

4. None of the above

Subtopic:  Spontaneity & Entropy |
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At constant pressure and temperature, the direction of any chemical reaction is one where the...... decrease.

1. Entropy

2. Enthalpy

3. Gibbs energy

4. None of the above

Subtopic:  Spontaneity & Entropy |
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The work done by a mass less piston in causing an expansion $∆$V (at constant temperature), when the opposing pressure, P is variable, is given by:

1. W= $-\int \mathrm{P}∆\mathrm{V}$

2. W=0

3. W= -P$∆$V

4. none of these

Subtopic:  2nd & 3rd Law of Thermodynamics |
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Entropy decreases during:

1. crystallization of sucrose from solution

2. rusting of iron

3. melting of ice

4. vaporization of camphor

Subtopic:  Spontaneity & Entropy |
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Entropy change of vaporization at constant pressure is given by:

1.

2. $∆{\mathrm{S}}_{\mathit{\left(}v\mathit{\right)}}=\frac{∆{\mathrm{U}}_{v}}{\mathrm{T}}$

3.

4. None of the above

Subtopic:  Spontaneity & Entropy |
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What is the entropy change for the reaction given below,

2H2 (g) + O2 (g) $\to$2H2O(l)

at temperature 300 K? Standard entropies of H2 (g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1mol-1 respectively.

1. -318.4 JK-1mol-1                           .

2. 318.4 JK-1mol-1

3. 31.84 JK-1mol-1

4. none of these

Subtopic:  Spontaneity & Entropy |
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If S$°$ for H2, Cl2 and HCl are 0.13, 0.22 and 0.19 kJ K-1mol-1 respectively. The total change in standard entropy for the reaction, H2 + Cl2 $\to$2HCl is:

1. 30 J K-1mol-1

2. 40 J K-1mol-1

3. 60 J K-1mol-1

4. 20 J K-1mol-1

Subtopic:  Spontaneity & Entropy |
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The direct conversion of A to B is difficult and thus it is converted by path A$\to$C$\to$D$\to$B. Given

Where e.u. is the entropy unit, then $∆{\mathrm{S}}_{\mathrm{A}\to \mathrm{B}}$ is:

1. +60 e.u

2. +100 e.u

3. -60 e.u

4. -100 e.u

Subtopic:  Hess's Law |
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