Calculate the value for E_0 for each of the following reactions. Decide whether

Question

Calculate the value for E_0 for each of the following reactions. Decide whether each is product favored in the direction written. a. Br_2(l) + Mg(g) rightarrow Mg^2+_(aq) + 2Br^-_(aq) b. Al_(s) + Sn^+_(aq) rightarrow Sn^2+_(aq) + Al^3_(s) 18. What is the pH of 0.0045 M solution of Aluminum Hydroxide? A. The equilibrium constant K_aq, for the reaction below at 25 deg C is 170. Suppose 15.6 grams of N_2O_4 is placed in a 5.000 Liter flask at 25 deg C. N_2O_4(g) rightarrow 2NO_4_(g) Calculate the following: a. The amount of NO_2 (in moles) present at equilibrium b. The percentage of the original N_2O_4 that is dissociated B. Write an equation for the reaction of Fe_2O_3(s) and C(s) to give Fe(s) and CO(g). How does Delta_rGdegree vary with temperature? Is there a temperature at which the reaction is spontaneous?

Explanation / Answer

1) (a) Br2(g) + Mg(s) ------> 2Br-(aq) + Mg2+(aq) ; E0 = 1.066 - (-2.37) = 3.436 V

(b) Al(s) + Sn4+(aq) ----> Sn2+(aq) + Al3+(aq) ; E0 = 0.15 - (-1.66) = 1.81 V

2) Al(OH)3(aq) -------> Al3+(aq) + 3OH-(aq)

[OH-] = 3*0.0045 M = 0.0135 M

pOH = -log[OH-] = 1.87

pH = 14 - pOH = 12.13

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