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Mass Percent

#### Q. 6. A glass of salt water (NaCl + H2O) has a density of 1.11 g mL^-1 and a molarity of 0.280 M. What is the percent by mass and percent by volume (each to two decimal places) of salt in the solution? NaCl has a density of 2.165 g cm^-3.

Solved • Sep 20, 2019

Mass Percent

#### Q. A solution is prepared by dissolving 32.0 g of acetic acid (CH3COOH; d = 1.05 g cm^-3) in 0.350 kg of water (d = 1.00 g cm^3) resulting in a final volume of 380.5 mL. Find each concentration of the solution (each to two decimal places): (c) percent by mass

Solved • Sep 20, 2019

Mass Percent

#### Q. A chemist mixes 82.0 g of diethyl ether with 21.5 g of acetyl bromide and 43.0 g of 4-methyl-2-pentanone. Calculate the percent by mass of each component of this solution. Be sure each of your answer entries has the correct number of significant digits.

Solved • Sep 14, 2019

Mass Percent

#### Q. An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol (d = 1.114 g/mL; M = 62.07 g/mol) and water (d = 1.00 g/mL) at 20 degrees C. Thedensity of the mixture is 1.070 g/mL. Express the concentration of ethylene glycol as (b) mass percent

Solved • Sep 14, 2019

Mass Percent

#### Q. A solution contains 0.510 mol of isopropanol (C3H7OH) dissolved in 3.070 mol of water. (b) What is the mass percent of isopropanol?

Solved • Sep 14, 2019

Mass Percent

#### Q. The amino acid tyrosine has an absorption peak at 290 nm. After appropriate treatment of a 0.2162-g sample to isolate the tyrosine, the sample volume was 250.0 mL. This solution had an absorbance of 0.118 in a 2.00-cm cell. A sample of pure tyrosine (MW = 181), weighing 126.4 mg, was dissolved in 100.0 mL of solution. A 10.00-mL aliquot of this solution, diluted to 250.0 mL, had an absorbance of 0.473 at 290 nm in a 1.00-cm cell. Calculate the percentage of tyrosine in the sample.

Solved • Sep 17, 2019

Mass Percent

#### Q. 9. What is the percent composition by mass (to one decimal place) of oxygen and hydrogen in 1 mol of water?

Solved • Sep 13, 2019