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A box contains 126000 red marbles and 885000 yellow marbles. What sample size is required to reduce the sampling standard deviation of red marbles to 1.85%
Determine the molar concentration of Na+ in a solution in which 6.315+/-0.004g of Na3PO4 has been added to 1000.0+/-0.4mL
Name two amino acids that are mostly positively charged at neutral pH. A Lysine and arginine B Histidine and arginine C Cysteine
concentrated sulfuric acid used in the labortory is 95% by mass. calculate the mass of water in 100-g
How many nucleotides are needed to code for a polypeptide with eleven amino acids
calculate the pH and concentration of all species present assuming that the activity coefficients are equal to 1.0 for all species
chloroform, CHCl3 has a ΔHvap = 29.4 kL/mol. what is it's vapor pressure at 25 degrees celsius
explain the biochemical changes that takes place during the investment phase of glycolysis
How do you calculate the mass of solvent (assume that the density of water is 1.000g/mL): Please show how to solve the problem. NaCl with a mass of 11.47g and volume of water 108.76g
a helium-filled weather balloon is launched from the ground where the pressure is 752 mmHg and the temperature is 21 degrees celsius. under these conditions its volume is 75.0 L.
The reaction A->B follows first-order kinetics with a half-life of 21.7 hours. If the concentration of A is 0.023 M after 48 hours, what is the initial concentration of A?
The vapor pressure of pure methanol, CH3OH, at 30 °C is 160. torr. How many grams of the nonvolatile solute glycerol, C3H5(OH)3, must be added to 131. g of methanol to obtain a solution with a vapor pressure of 133. torr?
Calculate the work done in kJ when 3.2 moles of H2O vaporizes at 1.00 atm and 38.8 oC. Assume the volume of liquid H2O is negligible compared to that of vapour.
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