(4) (22 pts) Gold metal dissolves in aqua regia, which is a mixture of concentrated hydrochloric...
(4) (22 pts) Gold metal dissolves in aqua regia, which is a mixture of concentrated hydrochloric and concentrated nitric acids, but gold does not dissolve in either acid separately. (You may write net ionic equations in this problem.) (a) (6 pts) Write a balanced chemical equation for the reaction of gold and nitric acid to produce Au(aq) and nitric oxide. Calculate the standard emf (in V) for this reaction. Is this reaction spontaneous under standard conditions at 25°C? (b) (6...
( (4 pts) The first stage of the Ostwald process is heating ammonia gas with oxygen gas in the presence of a catalyst at 900 K and 5 atm to form nitric oxide gas and water vapor. Write the balanced chemical equation for this reaction. (g) (4 pts) Evaluate AG (k) for this reaction at 900 K. Is the reaction spontaneous under standard conditions at 900 K? (h) (8 pts) The second stage of the Ostwald process begins by oxidizing...
(2) (4 pts) Gaseous nitrogen dioxide disproportionates spontaneously into nitric acid and nitrous acid in acidic aqueous solution. Show this by writing the balanced chemical reaction and evaluating the standard emf (in V) for the reaction. Useful Information Ed(V) Half-reaction red 2 H'(aq) 2 e > H2(g) 0.00 > NO2(g) H2O(I) +0.79 NO3 (аq) + 2 H" (аq) + е - NO: (aq) + 4 H (ад) + 3 е —> NO(g) + 2 H-0() +0.96 AuCla (aq) + 3...
Q7) A 1.23 g sample, which contains gold (Au), silver (Ag) and metal oxides, is treated with concentrated nitric acid (HNO;), which dissolves all the metals and metal oxides with the exception of the gold. The mass of yellow metal remaining is 7.4 x 10 g. The solution is then treated with aqueous sodium chloride (NaCI), which precipitates silver chloride (AgCI) and nothing else. A total of 0.196 g of AgCl is obtained. What is the percent gold and silver...
(3) (4 pts) Nitrous acid will not disproportionate spontaneously to the gases nitrogen dioxide and nitric oxide. Show this by writing the balanced chemical reaction and evaluating the standard emf (in V) for the reaction.
(2) (4 pts) Gaseous nitrogen dioxide disproportionates spontaneously into nitric acid and nitrous acid in acidic aqueous solution. Show this by writing the balanced chemical reaction and evaluating the standard emf (in V) for the reaction.
(3) (4 pts) Nitrous acid will not disproportionate spontaneously to the gases nitrogen dioxide and nitric oxide. Show this by writing the balanced chemical reaction and evaluating the standard emf (in V) for the reaction.
Metallic copper does not react with hydrochloric acid, but is oxidized by nitric acid since the nitrate ion functions as the oxidizing agent in acidic solutions. lf NO and Cu^2+ are formed as products, and the reaction is carried out under standard conditions, E^0 for the reaction of copper metal with nitric acid will be: +0.44 V +0.62 V +0.78 V +0.96 V HNO_3 (aq)+H_2O(l) NO_3^- (aq)+ H_3O^+ (aq) Cu(s)+ NO_3^- (aq) NO(g)+Cu^2+ (aq)
2. (6 pts) Using the activity series, predict which of the following reactions will occur and, in those cases, write balanced equations (otherwise, write "no reaction"). a) Potassium with water b) Gold with hydrochloric acid c) Aluminum with nitric acid
Part A Review Constants Periodic Table Decide whether or not each of the following metals dissolves in 1 M HNO3 For those metals that do dissolve write a balanced redox reaction showing what happens when the metal dissolves 70 Express your answer as a chemical equation. Enter noreaction if there is no reaction. Identify all of the phases in your answer. AEC Zn(s) + NO, (aq) + 2H+ (aq) → Zn²+ (aq) + NO(g) +H,O(1) Your answer is not a...