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A solution was prepared by adding 2.00g KCl (MW = 74.55g / mol) in 100.0 mL...
An aqueous solution of ethanol is prepared by dissolving 19.00 g of ethanol, C2H5OH, in 100.0 g of water. What is the molality of the ethanol solution? The formula mass of ethanol is 46.07 g/mol, and assume the density of water to be 1.000 g/mL
35) Calculate the concentration of a KCl solution prepared by adding 200 mL of water to 100. mL of 12% KCl solution.
Calculate the molality of a solution formed by adding 3.331 g of methanol (CH3OH) to 100.0 mL of water. The density of water is 0.9982 g/mL.
A) A chemist prepares a solution by adding 304 mg of Co(NO3)2 (MW = 182.94 g/mol) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 100 mL. Determine the molarity of the prepared solution. B) Determine the mass of chloride (MW = 35.45 g/mol) in grams present in 100mL of a 0.289 M solution of aqueous FeCl3 (iron(III) chloride). C) A beaker contains 250 mL...
A chemist prepares a solution by adding 320 mg of K2Cr2O7 (MW = 294.19 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 750 mL . Determine the molarity of the prepared solution.
You wish to prepare 100.0 mL of a 325.0 ppm w/v sodium (MW = 22.9897 g/mol) solution. How many grams of sodium dichromate dihydrate (Na2Cr2O7·2H2O, MW = 297.998 g/mol) are needed to prepare this solution? Assume the final solution has a density of 1.00 g/mL.
A solution of NaCl (MW = 58.5 g/mol) in water (MW = 18.0 g/mol) has the molality of 3.01 molal and the density of 1.112 g/mL. Consider mass of solvent 1 Kg A) What is the mass percent of the solute? (B) What is the molarity of the solution? (C)What is the mole fraction of H2O?
Challenging problem:Calculate the density of a solution made by dissolving 15 g KCl into 100.0 ml water. Do not neglect the volume contribution of KCl to the overall solution volume.
Calculate the molality of a dextrose (mw = 180.16 g/mole) solution prepared by dissolving 52.8 g dextrose in 500 mL of water (density of the solution is 1.06).
When 5.325 g of KCl dissolved in 100.0 ML of water, the temperature of the solution decreases from 24.1 Celsius to 21.2 Celsius. Calculate the amount of heat required for the KCl to dissolve. Calculate per ?H mol of KCl