1       The hemoglobin in red blood cells carries oxygen to body tissues

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1       The hemoglobin in red blood cells carries oxygen to body tissues. What amount of hemoglobin is in 25.0 mL of a hemoglobin solution with a concentration of 1.90 x 10^-3 mol/L? (4.75 x 10^-5 mol)

 

2       A lab technician adds 35.8 mL of a 0.0176-mol/L solution of potassium hydroxide, KOH_(aq), to a reaction mixture. What amount of potassium hydroxide does the technician add to the mixture? (6.30 x 10^-4 mol)

 

3       Seawater contains approximately 0.055 mol/L of magnesium chloride, MgCl₂(aq). What volume of seawater contains 4.1 mol of magnesium chloride?(75 L)

 

4       What volume of 7.6-mol/L hydrochloric acid, HCl_(aq), must be poured into a flask to obtain 0.050 mol of hydrochloric acid? (6.6 mL)

 

5       A lab technician must add 1.25 mol of iron chloride, FeCl₃(aq), to a flask using a 6.00-mol/L iron chloride stock solution. How many millilitres of the stock solution must the technician pour into the flask? (208 mL)

 

6       How many litres of a 0.0020-mol/L sodium dichromate solution, Na₂Cr₂O_7(aq), contains 5.0 mol of sodium dichromate? (2.5 x 10³ L)

 

7       Household bleach is an aqueous solution that contains 5.25 g of sodium hypochlorite per 100.0 mL of solution. What is the molar concentration of sodium hypochlorite in bleach? (0.705 mol/L)

 

8       A brine solution that is used in pickling contains 235 g of pure sodium chloride dissolved in 3.00 L of solution. What is the molar concentration of the sodium chloride? (1.34 mol/L)

 

9       A stock solution of hydrochloric acid is made by dissolving 7.66 g of hydrogen chloride, HCl(g), in enough distilled water to produce 1.50 L of solution. Calculate the concentration of aqueous hydrochloric acid in this stock solution. (0.140 mol/L)

 

10   Potassium dichromate solution is used to analyze the alcohol content of wine. A lab technician dissolves 102.9 g of solid potassium dichromate in enough distilled water to produce 1.75 L of aqueous potassium dichromate. Determine the concentration of aqueous potassium dichromate in this solution. (0.200 mol/L)

 

11   Calculate the mass of copper(II) sulfate pentahydrate required to prepare 1.50 L of aqueous copper sulfate solution with a concentration of 0.500 mol/L. (187 g)

 

12   A saline drip used in a hospital has a sodium chloride concentration of 0.154 mol/L. Calculate the mass of sodium chloride required to make a 250-mL solution of this concentration. (2.25 g)