Consider the following unbalanced reaction which in known to go to completion Cr
ID: 1001024 • Letter: C
Question
Consider the following unbalanced reaction which in known to go to completion CrCl_3(aq) + AgNO_3(aq) rightarrow AgCl(s) + Cr(NO_3)_3(aq) The reaction was accomplished by mixing 15.0 ml of 0.020 M CrCl_3(aq) solution with 25.0 ml. of 0.016 M AgNO_3(aq) solution Mow many moles of AgCl(s) will be formed? 4.0 times 10^-4 mol 3.0 times 10^-4 mol 9.0 times 10^-4 mol 2.0 times 10^-4 mol 1.3 times 10^-4 mol Consider the following electrochemical cell for the next 3 questions: Zn | ZnBr_2(aq, 1.0 M) || NaBr (aq. 0.010 M), AgBr(s) | Ag What is E degree_cell? 1.56 V 0.69 V -0.69 V -0.83 V 0.83 V What would be Delta G degree for the reaction spontaneously occurring in this cell based on E degree_cell? -301 kJ/mol -133 kJ/mol 133 kJ/mol 160 kJ/mol -160 kJ/mol What is E_cell for the concentrations given? 0.95 V -0.95 V 0.57 V 0.89 V -0.89 V (EC) The stoichiometric coefficients for Na_2S_2, Na_2SO_4, and H_3PO_4 for the reaction below arc respectively___,___,___. You have to balance the reaction first! Na_2S_2 + Na_2SO_4 + H_3PO_4 rightarrow S + H_2O + Na_3PO_4 3, 1, 8 6, 1, 4 6, 1, 8 3, 1, 4 9, 3, 8Explanation / Answer
23. Moles of AgCl formed = moles of AgNO3 present
(a) 4 x 10^-4 mol
24. For the cell, Eocell,
(e) 0.83 V
25. dGo is = -nFEocell,
(e) -160 kJ/mol
26. Ecell = Eocell - 0.0592/2 log(0.01/1)
(d) 0.89 V
27. Stoichiometric coeffiicients needed are,
(e) 9,3,8