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Compute why you must have a liquid flowing back through the fractionating column in order to get the separation of the components during fractional distillation?
What is the osmotic pressure, in atm, of a solution formed by dissolving 17.8 g of PbCl4 in 0.250 L of water at 64.4 oC? (R = 0.0821 L-atm/mol-K; 0 oC = 273 K)
An isotonic solution is described as 0.92% NaCl (g/mL). Would this also be the required concentration for isotonic solutions of other salts, such as KCl, MgCl2,
Explain what are the possible manipulation errors that might contribute to the errors in results of obtaining a larger amount of NaCl than was present in the original sample
a)Calculate the theoretical yield of when 109g of C2H6 reacts with 228g Cl2 of , assuming that and react only to form C2H5Cl and HCl .
Draw and discuss the mechanism of the Diels-Alder reaction (with arrows to show the electron movements). Draw the orientation of the reacting p-orbitals and indicate how they overlap to form product.
Calculate the pH of a solution prepared by mixing 20mL of .20M NH3 with 40mL of .10M HNO3 (Kb for NH3= 1.8 x 10^-5)
A solution is made by mixing 25.0 mL of .20 M sodium sulfate with 50.0 mL of 0.50 M sodium sulfate. Assuming that dissociation is complete, what are the concentrations Of the Na+ and SO42- ions
Which is predicted to be the most ionic substance?
Concentrations of flouride in drinking water grerater than 4.0 mg/L can cause mottled teeth in children. What is 4.0 mg/L expressed as molality
Calculate the wavelength in meters of light absorbed by an electron in an atom of hydrogen as it moves from n=3 to n=6.
State the chemical formula of salt and classify the bond as ionic, polar covalent, or non-polar covalent.
Which elements with an atomic number greater then 40 can be expected to have chemical properties similar to those of the element Br and what is the periodicity of the two
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