45. (2 pts. Show your work) A solution of acetic acid, CH,CO.H, is prepared by d

Question

45. (2 pts. Show your work) A solution of acetic acid, CH,CO.H, is prepared by dissolving 30.0 mL of acetic acid in enough water to give a total volume of 150.0 ml. What is the percent-by-volume concentration of acetic acid? A. 16.7% B. 15.0% C. 30.0% D. 20.0% E. 25.0% 46. (2 pts. Show your work) How many moles of NaCI are contained in 50.0 ml of 2.50 M NaCI? A. 2.50 moles B. 0.050 moles C. 5.00 moles D. 2.45 moles E. 0.125 moles 47. (2 pts. Show your work) What volume of 2.00 M HCI contains 0.50 mol HCI? A. 1.0L B. 0.25 ml C. 250 ml D. 4.0L E. 250 L 48. (3 pts. Show your work) A solution contains 15.5 g of NaOH dissolved in sufficient water to give a total mass of 12 g. What is the molality of the solution? A. 3,54 m B. 0.124 m C. 0.00310 m D. 3.10 mm E. 124 m

Explanation / Answer

45:

Volume of acetic acid = 30.0 mL.

Volume of solution = 150.0 mL

% by volume of acetic acid = ( volume of acetic acid / volume of solution) x 100%

= ( 30.0 mL / 150.0 mL) x 100%

= 20.0%

Hence, the correct option is D. 20.0%.

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