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a) The elemental calcium (Ca) is produced by the electrolysis of molten CaCl2. Explain how many pounds of calcium can be obtained if current is applied for 48 h 6.5x103 A? Presume a cell efficiency of 70%.
b) Explain two electrolytic cells connected in series. Knowing that one of them is deposited 0.50 g of silver (Ag) from a solution of AgNO3, compute the mass of chromium (Cr) is deposited on the cathode of another cell from a solution of Cr (NO3) 3.
One can approximate boiling point at reduced pressure using a pressure-temperature nomograph. What would you expect the observed boiling point to be at 50 torr for a liquid that has a boiling point of 280 degrees celsius at 760 torr
Calculate the freezing point and boiling point of the solution. Kf benzene = 5.12 C/m Kb = 2.53 C/m
A solution is prepared by dissolving 25.0 g of ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is added to50.0 mL of water. Calculate the concentration of ammonium ions and sulfate ions ..
during the dehydration reaction when acetaldehyde was reacted with koh in ether an intermediate was formed. what was
Calculate the approximate amount of unknown acid to use such that it would require about 15 mL of 0.05M NaOH to reach the endpoint.
Solid ammonium fluoride is slowly added to 125 mL of a magnesium sulfate solution until the concentration of fluoride ion is 0.0476 M. The maximum amount of magnesium ion remaining in solution is
The bright-red color of highway safety flares comes from strontium ions in salts such as Sr(NO3)2 and SrCO3. Burning a flare produces strontium ions in excited states,
The heat of fusion of water is 334 J/g, and the specific heat of water is 4.18 j/g degrees C. How many joules of heat are released when 20.0 g of water at 30.degrees C is cooled to 0.0 degrees C and frozen to ice at 0.0 degrees C.
Sulfurous acid, H2SO3, is a weak diprotic acid (pKa,1=1.89 and pKa2 =(7.21 at 25oC). What is the pH of 0.121 mol/L H2SO3(aq) at 25oC?
Calculate pCd2 at each of the following points in the titration of 50.00 mL of 0.0060 M Cd2 with 0.0060 M EDTA in the presence of the auxiliary complexing agent NH3
A gas mixture with a total pressure of 740 mmHg contains the following gases at the indicated partial pressures: CO2= 115 mmHg; Ar= 220 mmHg and O2=150 mmHg. The remaining gas in the mixture is helium. What is the mole fraction of helium gas in th..
Magnesium metal is used as a sacrificial anode to reduce the corrosion of underground storage tanks (made of iron, more accurately steel). As a result the sacrifical metal corrodes instead of iron. Explain
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