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PLEASE ANSWER ALL QUESTIONS 1. (1 pt) ______ Calculate the volume of 0.00500 M stock solution needed...

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Chemistry

PLEASE ANSWER ALL QUESTIONS

1. (1 pt) ______ Calculate the volume of 0.00500 M stocksolution 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 extinctioncoefficient of 36.0 L mol-1cm-1, a pathlengthof 1.00 cm, and an absorbance of 0.0900, what is the concentrationof 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 ofCu(C2N2H8)2SO4?(Show the correct significant figures)

            a. 279.83  

            b. 183.76

            c. 219.72

            d. 278.  

4. (1 pt)   ______ What is λmax?

            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

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