Question

PLEASE ANSWER ALL QUESTIONS

1. (1 pt) ______ Calculate the volume of 0.00500 M stock solution needed to make 10.00 mL of 0.00300 M solution.

             a. 16.7 mL

             b. 6.00 mL

             c. 0.0600 mL

             d. 3.00 mL

2. (2 pt) ______ If a solution sample has an extinction coefficient of 36.0 L mol^-1cm^-1, a pathlength of 1.00 cm, and an absorbance of 0.0900, what is the concentration of the solution in molarity? (Use Beer’s Law, A = εbc)

             a. 0.003 M

             b. 400 M

             c. 3.24 M

             d. 0.00250 M

3. (2 pt)   ______ What is the molar mass of Cu(C₂N₂H₈)₂SO₄? (Show the correct significant figures)

             a. 279.83  

             b. 183.76

             c. 219.72

             d. 278.  

4. (1 pt)   ______ What is λ_max?

             a. The extinction coefficient of a substance   

             b. The wavelength at which a substance absorbs the most light.

             c. The wavelength with the largest value.  

             d. The frequency of light that is maximum

Answer 1

1.). b

2.). d

3). a

4). b