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A sheet of steel 1.5 mm thick has nitrogen atmospheres on bothsides at 1200oC and is permitted to achieve asteady-state diffusion condition. the diffusion coefficient fornitrogen in steel at this te
Calculate the fraction of atom sites that are vacant for lead atits melting temperature of 327oC (600K). Assume anenergy for vacancy formation of 0.55 eV/atom.
How would you change the experimental procedure of the synthesis & purification of acetylferrocene to synthesize & purifydiacetylferrocene?
If potassium carbonate is used to selectively precipitateone of the cations while leaving the other cation in solution,which cation will precipitate first?
Calculate the value of the equilibrium constant,Keq,for the above reaction at 298.15Kelvin? Use the standard gibbs free energy change you calculated above.
What mass of Cu(s) is electroplatedby running 23.5 A of current through a Cu2+ (aq) solution for 4.00 h?How many minutes will it take to electroplate 23.1g of gold by running 5.00 A of current through
How many hours are required in order to reduce 325 mL of a 0.481 M solution of CuCl2 to 0.226 M in 0.226 M in Cu2+ using a 0.978 A current
If a chemist produced 926.77 g. of zinc sulfide at the end of the experiment, what mass of zinc was initially placed into the reaction chamber?
Calculate the pH during the titration of 100.00 mL of 0.200 M HNO3 with 0.400 M KOH after 0, 25.00, 50.00, and 75.00 mL of KOH have been added.
In a chemical reaction, the products have a lower potentialenergy than thereactants. This reaction must have a negative (1) DG; (2) DS; (3) DH; (4)DX. Can you explain why?
Secondary alkyl halides can undergo substitution by Sn1 or Sn2mechanisms. Explain why the Sn2 mechanism is more favored (interms of electronic interactions) if the alkyl halide is alpha to acarbonyl
An HCl solution was made by mixing 20mL of concentrated 12M HCl with 100mL of isopropyl alcohol. What is the molarity of the resulting solution? How many mL of this HCl solution is required to neutr
BaCl2 + Na2SO4 ↔BaSO4 + NaCl- Gravimetic determination of sulfate1) Explain, why adding an excess of Ba+2 will causea more complete precipitation of BaSO4.2)
BaCl2 + Na2SO4 ↔BaSO4 + NaCl-Gravimetric Determination of Sulfate1) A procedure similar to the described in this experimentcould be used to precipitate Cl- as PbCl2.
10.00mL of 1.98· 10-3 mol/L NaSCN solutionwere mixed with 10.00mL of 8.07· 10-4 mol/L iron(III) nitrate solution. When the reaction reached equilibrium, the absorbance measured at 447
Based on the ionization energies of the alkali metals, which alkalimetal would you expect to undergo the least exothermic reaction with chlorine gas?
A photon of ultraviolet (UV) light possesses enough energy to mutate a strand of human DNA. What is the energy of a single UVphoton having a wave length of 24nm?
A 5.00-g quantity of a diprotic acid was dissolved in water and made up to exactly 250mL. Calculate the molar mass of the acid if25.0mL of this solution required 11.1mL of 1.00M KOH for neutralizati
A student designs an ammeter (a device that measures electricalcurrent) that is based on the electrolysis of water into hydrogenand oxygen gases.
A 77.4 g ice cube floats in the Artic Sea. The temperature and pressure of the system and surroundings are at 1 atm and 0C.Calculate ΔSsys, ΔSsurr,ΔSuniv, for the melting of the ice
Calculate the percentage of azomethane that it will decomposein 10 minutes if the initial concentration of azomethane is equal to1.5×10-2M.
An aqueous ammonium chloride solution, rather than sulfuric acid,is used in the hydrolysis of the magnesium complex of1,1-diphenylethanol to ensure that no acid-catalyzed dehydrationoccurs.
A gas with a volume of 525 mL at a temperature of -25 Celsius isheated to 175. What is the new volume of the gas if pressure and number of moles are held constant?
If acetone, rather than acetophenone, were reacted with phenylmagnesium bromide, followed y hydrolysis of the intermediate magnesium complex, what would the organic product be?
If the half reaction at an electrode is the reduction of zinc fromzinc 2+ ions, how many grams of zinc would be produced from passing a current of 0.5 amps for 2 hours.