Exam3A - Chemistry 41 Exam 3 Name _ (Please Print) PID# _...

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Calibration Curve 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 1 02 03 04 05 06 0 mg protein absorbance Chemistry 41 Name __________________________ Exam 3 (Please Print) PID# ___________________________ Row ____Seat # _____ Honor Pledge: I have neither given nor received help on this exam, nor have I seen anyone else do so. _______________________________(Signed) 1. 2. 3. 4. 5. 6. 7. 8. Total _______ 15 10 15 10 10 10 15 15 100 SHOW YOUR WORK CIRCLE NUMERICAL ANSWERS 1. (15pts) The mass of an ion in a high-resolution mass spectrum is 83.0565. Which composition, C 5 H 7 O + or C 6 H 11 + is most likely correct? What is the mass accuracy? C 5 H 7 O + 5(12.0000) + 7(1.0078) + 15.9949 = 83.0495 or from periodic table 5(12.01) + 7(1.008) + 16.00 = 83.106 C 6 H 11 + 6(12.0000) + 11(1.0078) = 83.0858 or from periodic table 6(12.01) + 11(1.008) = 83.148 = = = 0495 . 83 0070 . 0 0495 . 83 0495 . 83 0565 . 83 m m = ma 8.4 x 10 -5 = 84 ppm or from periodic table = = = 106 . 83 0495 . 0 0495 . 83 0565 . 83 106 . 83 m m = ma 5.95 x 10 -4 = 595 ppm 2. (10 pts) Using the calibration curve below, determine the quantity of unknown that has an absorbance of 0.67 if a blank had an absorbance of 0.07. A = 0.67-0.07 = 0.60 = 48 mg protein
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3. (15 pts) Fill in the following Table and explain which element would be the best to detect by atomic emission.
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Exam3A - Chemistry 41 Exam 3 Name _ (Please Print) PID# _...

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