1-3: A stock solution of 70% v/v ethanol was diluted with distilled water to prepare 1L of 21% v/v ethanol. (Density of ethanol = 0.789 g/mL; MW of ethanol = 46 g/mol) 1. Determine the initial volume of 70% v/v ethanol used in the preparation. 2. How much water was added to the stock solution to make 1L of the final concentration? 3. The molarity of 5.0 mL of 70% v/v ethanol was found to be __________.
1-3: A stock solution of 70% v/v ethanol was diluted with distilled water to prepare 1L of 21% v/v ethanol. (Density of ethanol = 0.789 g/mL; MW of ethanol = 46 g/mol)
1. Determine the initial volume of 70% v/v ethanol used in the preparation.
2. How much water was added to the stock solution to make 1L of the final concentration?
3. The molarity of 5.0 mL of 70% v/v ethanol was found to be __________.
4-6: A solution contains 45.0 g of methanol, CH3OH, dissolved in sufficient water to give a total mass of 210.6 g.
4. Compute for the number of moles of the solute present in the given solution.
5. What is the mass (in kg) of water used to dissolve the solute from the given problem?
6. Determine the molal concentration of the said solution.
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