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Unformatted text preview: Final exam KEY Chem 1230 F2007 5B. Decomposition of KClO4 20ºC 17.5 mmHg 21ºC 18.6 mmHg 22ºC 19.8 mmHg 23ºC 21.1 mmHg 24ºC 22.4 mmHg 25ºC 23.7 mmHg 26ºC 25.2 mmHg 27ºC 26.7 mmHg 28ºC 28.3 mmHg 29ºC 30.0 mmHg ü All versions A 46.3 mL sample of gas is collected over water at 29ºC and at 759 mmHg using an experimental set | up the same as in experi- ment 5B. How many moles of gas are in the sample? R = 0.08206 L•Atm/(mol•K) n ã P V R T ã I 729- 25.2 760 Atm M I 46.3 1000 Liter M J 0.08206 Liter Atm Mole DegK N H 26 + 273 L DegK n ã 0.120272 Kelvin Mole P V Joule T ã 0.00174749 Mole 7. Absorption spectrum of CoCl2 If I0 is the intensity of light going into a spectrophotometer cell, and I is the intensity of light coming out, a. What is the formula for the transmittance T of the cell ? T ã I I b. What is the formula for the absorbance A of the cell? A ã - Log 10 @ T D ã - Log 10 B I I F c. Beer’s Law relates absorbance A with the concentration c of some colored material in solution. It uses a constant k. Writec....
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This note was uploaded on 04/02/2008 for the course CHM 1230 taught by Professor Mcclain during the Fall '07 term at Wayne State University.
- Fall '07