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When 24.0g of glucose (a nonelectrolyte) are dissolved in 500.g of water the solution has a freezing point of -0.47degreee C. What is the molar mass of glucose?
A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.49. What was the concentration of the solution? The Ka of lactic acid is 1.4 10-4.
What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate, Ca(NO3)2, in 250 mL of water? (The molar mass of Ca(NO3)2 is 164 g/mol.)
albr3 is sold as a solution in ch2br2. this is a rather exotic solvent and somewhat difficult to work with as well
The emf of a cell made of a Zn anode and hydrogen cathode immersed in 0.5M ZnCl2 is +0.590V. What is the pH of the solution
Outline the mechanism of the reaction of acetyl chloride with NaN3 to give acetyl azide. This reaction is known as Nucleophilic Acyl Substitution.
Determine which of the following reactions are oxidation-reduction reactions and which are not. what type of reaction do you have if it is not an oxidation-reduction reaction?
Calculate the number of moles of NaOH required for the titration. Calculate the number of moles of HCl in hte HCl sample titrated.
A variation of this experiment uses a balloon as the container for the carbon dioxide. Describe any additional measurements that you must make in order to find the molar mass by this method.
effuses through a hole in a plate in the same amount of time it takes 20.54 mL of another gas to effuse through the same hole under the same temperature and pressure conditions. Determine the molar mass of the unknown gas.
Imagine that 1.00 mol H2O(l) is placed in a piston with a constant external pressure Pext = 1 bar. The piston is then placed in a large thermal bath at a temperature of 270 K.
given the ff reaction2nobr g lt------gt 2nog br2gan equilibrium mixture in a 5.00 l vessel at 100 degree celsius
2 NaClO3 2 -> NaCl + 3 O2 Determine the number of moles of O2 produced by the decomposition of 639 g of NaClO3.
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