How many moles of O2 gas are produced at 1 atm pressure and 25 °C by the electrolysis of an aqueous solution of Na2SO4 if 0.400 A is passed through the solution for 80.0 minutes? Here is the oxygen reduction reaction. O2(g) + 4 H+ (aq) + 4 e 2 H₂O(l) Report your answer in moles to three significant figures. Do NOT use scientific. notation. Do NOT put units in the answer box. Me

Be sure to answer all parts. Over a period of time, the concentration of sulfuric acid in the lead storage battery of an automobile has decreased from 38.0 percent by mass (density = 1.29 g/mL) to 26.0 percent by mass (1.19 g/mL). Assume the volume of the acid remains constant at 709 mL. (a) Calculate the total charge in coulombs supplied by the battery. x 10 с Enter your answer in scientific notation. (b) How long (in hours) will it take to recharge the battery back to the original sulfuric acid using a current of 23.4 A? h

Consider the redox reaction shown below: IO3-1(aq)    +  5 I-1 (aq)   +   6 H+1 (aq)   →   3 H2O (l)   +   3 I2 (aq) What is the reducing agent?

The amount of lactic acid, HC3H5O3, produced in a sample of muscle tissue was analyzed by reaction with hydroxide ion. Hydroxide ion was produced in the sample mixture by electrolysis. The cathode reaction is given below. 2 H2O(l) + 2 e− → H2(g) + 2 OH− (aq) Hydroxide ion reacts with lactic acid as soon as it is produced. The endpoint of the reaction is detected with an acid-base indicator. It required 104 s for a current of 13.1 mA to reach the endpoint. How many grams of lactic acid (a monoprotic acid) were present in the sample?

Balance the following equation and write the sum of the coefficients of the reactants and products under basic conditions. BH41 is a hydride. BH4 0) + H2Oe → H3BO3laa) + H2a9) C 14 С 13 С 12 С 17 O 10 С 16 C 11 C 9 C 15

The hydroperoxide ion, HO2–(aq), reacts with permanganate ion, MnO4–(aq) to produce MnO2(s) and oxygen gas. Balance the equation for the oxidation of hydroperoxide ion to O2(g) by permanganate ion in a basic solution.

Suppose 190. mmol of electrons must be transported from one side of an electrochemical cell to another in 21.0 minutes. Calculate the size electric current that must flow. Be sure your answer has the correct unit symbol and the correct number of significant digits. 0 x10 • X μ Ś