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Purification of nickel can be acheived by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell. How many hours will it take to plate 19.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 43.5 A? Assume the nickel in the electrolytic solution is present as Ni2.
Calculate the free energy change for the following reaction and predict whether the reaction occurs spontaneously at 25 degrees celcius. H2(g)+CO2(g)-->H20(g)+CO(g); ?H=41.8 kJ, ?S=42.1 J/K
How many grams of KCl are present in 250.0 mL of a 0.125 M solution? [Use formula weight: KCl, 74.55 g/mol]
An aqueous CaCl2 solution has a vapor pressure of 82.1 mmhg at 50 C . The vapor pressure of pure water at this temperature is 92.6 mmhg What is the concentration of in mass percent?
The pKa's of benzoic acid and 4-nitroanilinium hydrochloride are 4.2 and 1.0, respectively.
The element M forms the chloride MCl4 containing 75.0% Cl by mass. What is the atomic weight of M?
Write a net ionic equation for the precipitation reaction, if any, that occurs when aqueous solutions of the following ionic compounds are mixed. Cu(Ch3COO)2 and Na3PO4.
What is the rate of the above reaction? What is the closest numerical value of K for the above reaction? What are the units for the rate constant for the reaction?
If 95.0 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.
A zero-order reaction has a constant rate of 3.20×10-4 . If after 60.0 seconds the concentration has dropped to 6.50×10-2 , what was the initial concentration?
The partial pressures of PCL5, PCl3, and Cl2 are .875 atm, .463 atm, and 1.98 atm. What is the value of equilibrium constant?
The temperature remains unchanged. Determine the final pressure of the system of two tanks.
When methanol, CH3OH, is dissolved in water, a nonconducting solution results. When acetic acid, CH3COOH, dissolves in water, the solution is weakly conductiong and acidic in nature. Describe what happens upon solution dissolution in the two cases..
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