Question

what mass of 20% ethyl alcohol solution(mass/volume) of density 1.4g/ccis needed to prepare 200ml solution of the alcohol continuing 20g per liter of solution.​

Answer 1

Answer:

Explanation:

The concentration of a solution is often expressed as percent concentration by mass or percent by volume of solute in solution. Percent by mass is calculated from the mass of solute in a given mass of solution. A 5%-by-mass aqueous solution of sodium chloride contains 5 g sodium chloride and 95 g water in each 100 g solution.

Percent by mass = mass of solute

                               ____________________

                                  mass of solution X 100%

If both solute and solvent are liquids, the concentration may be expressed as percent by volume. Both ethyl alcohol and water are liquids; the concentration of alcohol-water solutions is often given as percent by volume. For example, a 95% solution of ethyl alcohol contains 95 mL ethyl alcohol in each 100 mL solution.

Percent by volume = volume of solute

                                            _______________

                                             volume of solution X 100%

Please mark it as Brilliant