Week 1 Assignment I. Determine the molar concentration of ethanol in a beer that

Question

Week 1 Assignment I. Determine the molar concentration of ethanol in a beer that has a 7.3% (v/v) alcohol 2. What is the ppm concentration of barium, and chloride, in a 348 M aqueous solution of 3. A solution is prepared by dissolving 25.65 mL of butanol in 550.0 mL of octanol. Determine content? barium chloride? the concentration of the solute in each of the units below. Note that the density of butanol is 0.810 g/mL and octanol is 0.818 g/mL a) Molarity b) Molality c) ppt (parts per thousand) Do What is the molarity of H20 in pure water at 15.0°C? What is the molality of this liquid? these values change at different temperatures? 4.

Explanation / Answer

7.3 % (v/v) ehtanol in beer

7.3 ml of ethanol in 100 ml (0.1 L) of beer

density of ethanol = 0.789 g/ml

Mass of ehtanol = 7.3 ml * 0.789 g/ml = 5.76 g

Molar mass of ethanol = 46 g/mol

No. of moles of ethanol = 5.76 g / 46 g/mol = 0.1252 moles

molar concentration = No. of moles of ehtanol / volume of solution = 0.1252 moles / 0.1 L = 1.252 M answer

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