#34 | Solved Problems
(Chemistry) > Thermodynamics
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At absolute zero, the entropy of a perfect crystal is zero. This is........... of thermodynamics.

(a) first law               (b) second law

(c) third law              (d) none of these

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Entropy change of vaporization at constant pressure is given by:

1. S(v)= HvT                 2. S(v)=UvT3. S(v)= HvP                 4. none of these

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What is the entropy change for the reaction given below, 

2H2 (g) + O2 (g) 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.

(a) -318.4 JK-1mol-1                           (b) 318.4 JK-1mol-1 

(c) 31.84 JK-1mol-1                             (d) none of these

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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 2HCl is:

(a) 30 J K-1mol-1                         (b) 40 J K-1mol-1

(c) 60 J K-1mol-1                         (d) 20 J K-1mol-1

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The entropy change in the fusion of one mole of a solid melting at 27°C (latent heat of fusion is 2930 J mol-1) is                                                                                              

(a) 9.77 JK-1mol-1                (b) 10.73 JK-1mol-1               

(c) 2930 JK-1mol-1                (d) 108.5 JK-1mol-1          

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