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Problem- Purification of copper can be acheived by electrorefining copper from an impure copper anode onto a pure copper cathode in an electrolytic cell. How many hours will it take to plate 12.0 kg of copper onto the cathode if the current passed through the cell is held constant at 35.0 A? Assume the copper in the electrolytic solution is present as Cu2.
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Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the equation
A flask of water is connected to a powerful vacuum pump. When the pump is turn on, the water begins to boil. After a few minutes, the same water begins to freeze. Eventually, it disappears. Define what happens at each step
Use Kirchoff's law to calculate ?vapH , the molar enthalpy of vaporization, of a substance at 218.15 K, given that its standard enthalpy of vaporization is ?vapH=32.45 kJ mol at 25.0ºC.
Calculate the amount of heat absorbed by the solution. Find the enthalpy change for the dissolution of KOH
The density of potassium, which has the BBC structure and one atom per lattice point, is 0.855 g/cm3. The atomic weight of the potassium is 39.09 g/mol. Calculate the lattice parameter and the atomic radius of potassium.
Calculate the change in molar Gibbs energy of tristearin when a deap-sea creature is brought to the surface ( p=1atm) from a depth of 2km. To calculate the hydrostatic pressure, take the mean density of water to be 1.03g/cm
Which one of the ions (i) Cl- and (ii) Ce3+ will be oxidized by MnO4- in acidic solution? Write balanced equations for these and calculate the standard potential for each reaction?
what is the total pressure in a canister that contains oxygen gas at a partial pressure of 804 mm Hg, nitrogen at a partial pressure of 220 mm Hg, and hydrogen at a partial pressure of 445 mm Hg.
at 760k 85 of a sample of cyclopropane changes to propane in 79.0min. calculate the value of the rate constant for this
All concentrations remain constant
Differentiate between the spectral features in the MS, CNMR, HNMR and IR of benzoic acid and methyl benzoate
a robust first grader goes for swimming lessons three times a week and he enjoys it thoroughly. during the first week
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