chem 102 help please 15. For the process shown below: Br (l) 2 Br (g) A) H is ne

Question

chem 102 help please

15. For the process shown below: Br (l) 2 Br (g) A) H is negative and AS is positive B) 11 is positive and is negative C) } l is positive and S is positive D) H is negative and as is negative Which of the following statements is TRUE for the cell shown below? 16. Zn (s) Zn (aq) || Cu* (aq) Cu (s) A) The mass of the zinc electrode increases during discharge B) The mass of the zinc electrode decreases during discharge C) Electrons flow from the copper electrode towards the zinc electrode D) The concentration of the zinc ions decreases during dishcarge 17. Calculate AS n for the following reaction. The So for each species is shown below the reaction. 4 NHs (g) + 5 O2 (g) 4 NO (g) + 6 H2O (g) S°(J/mol-K) 192.8 205.2210.8 188.8 A) +178.8 J/K B) -336.6 J/K C) -401.2 J/K D) +287.4 J/K 18. How many electrons are transferred in the following reaction? (The reaction is unbalanced.) 12 (s) + Fe (s) Fe"(aq)-t (aq) A) 6 B) 3 C) 4 D) 2 19, The Eo for the reaction shown below is +1.50 volts, what is Ga for this reaction? Au', + 3 e- Au (s) A) 606 kJ B) 145 k) C) -34.5 kJ D) 434 kJ

Explanation / Answer

15. Option A, since liquid is converted to the gas, randomness increased. Hence entropy is positive and Enthalpy is negative

16. Option B, since Zn looses the electrons

17. Option A,

Entropy change of reaction = sum of entropy change of products - sum of change in entropy of reactants

Delta Srxn = [4x 210.8+6x188.8] - [4x192.8+5x205.2]

= 1976 - 1797.2= 178.8 J/K

18. Option A, 6 electrons as follows

3 I2 + 2 Fe = 2 Fe3+ + 6 Cl-

19.Option D

We know that Delta G = - nFE0

= - 3x 96500x 1.5 =

   = - 434250 J = - 434 KJ

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