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Briefly state the structural requirements of perovskites.
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- Determine the solubility parameters for amorphous polypropylene and poly(methyl methacrylate). (Densities of the two polymers are 0.905 and 1.18 g/mL, respectively.) Consult a polymer handbook and suggest suitable solvents for the two polymers on the basis of solubility parameters.(a) A commercial 737 jet transporting 143 passengers and 5 crew members from Kansas City (MCI) to Baltimore (BWI) burned 11,800 lb (about 1700 gallons) of Jet A fuel en route. Jet A fuel is kerosine based, consisting primarily of CnH2n+2 hydrocarbons, with n =6 to 16, so the carbon:hydrogen ratio is close to 1:2. During this flight, how much CO2 was released into the atmosphere? Assume the combustion of the fuel was complete, so all the fuel was burned to form CO2 and H2O. Give both the mass of CO2 produced (in kg and in lbs) and the volume it would occupy at 298 K, 1 atm.(b) How much CO2 would be released into the atmosphere if those passengers and crew made the trip instead, in pairs, in hybrid cars at 40 miles per gallon. Assume the density of the gasoline is 0.75 kg L-1 and that carbon and hydrogen dominate the composition in a ratio of 1:2. The road trip is 1082 miles.3. Distinguish between electrode and membrane polarizations. Which one is associated with ore bodies? Why?
- 1. What are the important considerations in determining the % ash content and elemental contents of plants under investigation? 2. Suggest other methods of analysis of commercial herbal drugs. Enumerate and discuss each.Why is water not used as a solvent in extraction of nutsGive the advantages of using steam distillation in the recovery of an inorganic liquid from a mixture.
- b) Determine the standard enthalpy change and std. Gibbs free energy change of D reaction at 400 k for the reaction CO(g) +2H2(g) → CH;OH (g) At 298.15 K, AH CO (9)= -26.41 kcal/mol, AH.CH,0H(9)= -48.08 kcal/mol, (9)= -32.8079 kcal/mol, AG CH30H(g)= -38.69 kcal/mol, The standard heat capacity of various components is given by, C = a + bT + cT2 + dT³, where C is in cal/mol-K and T is in K b x10² c x105 d x10º Сomponent CH3OH a 4.55 2.186 -0.291 -1.92 CO 6.726 0.04 0.1283 -0.5307 H2 6.952 -0.0457 0.09563 -0.2079Determine the gravimetric factor of CrO4 in K₂Cr2O7. The atomic weight of chromium is 52g/mol 0.7891 0.3946 0.8791 0.4936 оSuppose two phosphate groups in DNA (each with a charge of 21) are separated by 12 Å. What is the energy of the ionic interaction between these two phos- phates assuming a dielectric constant of 80? Repeat the calculation assuming a dielectric constant of 2.
