5.  Given the following information:

Calculate the net change in energy for the reaction 2Li(s) + 2HCl(g) → 2LiCl(s) + H₂(g)

 A. Ru

B. W

C. MgBr2

D. NO2

E. HCl (aq, acid)

2.  The reaction between bromate ions and bromide ions in acidic aqueous solution is given by the following equation: → 3Br2(l) + 3H2O(l) Using the following four experiment results to determine the orders (x, y, z) for all three reactants. Also calculate the rate constant. 

3.  Consider the following hypothetical reaction (at 308 K). Standard free energies, in kJ/mol, are given in parentheses. What is the value of the equilibrium constant for the reaction at 308 K?

4.  Gold (atomic mass = 197 g/mol) is plated from a solution of chlorauric acid, HAuCl4; it deposits on the cathode. Calculate the time it takes to deposit 0.65 g of gold, passing a current of 0.14 amperes. (1 faraday = 96,485 coulombs)

(c) (5%) What is the Gibbs free energy of freezing water at -10°C? (Molar melting enthalpy of ice: △mH° = 5619 J mol -1at–10°C, △mH° = 6008 J mol-¹ at 0°C; molar heat capacity: ice Cp,m=37.66 J mol-¹K-¹, water Cp,m-75.38 J mol¹K¹)

(b) (5%) The entropy of change for the isolated system upon freezing includes the entropy change of the surrounding as the entropy change of the water. Since the heat capacity of surrounding is large, the heat evolved by the water on freezing us absorbed by the surrounding with only an infinitesimal change in temperature. Calculate the entropy change of the surrounding! What is the change in the entropy of the universe?

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