Fall 2007 exams - Name (Please write your name on the back...

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N a m e (Please write your name on the back too) CE 3230 Fall 2007 Quiz #1 1. A coal-fired power plant burns 10,000 metric tons (MT) per day of coal. The coal contains 5% by weight noncombustible ash. Pollution control devices capture 99.9% of the ash, the captured ash is buried, and the rest is emitted to the atmosphere. How much ash (MT) is emitted to the atmosphere each year? [2 points] 183 MT/yr 2. According to the reaction [1 point] 2 Al + 6 HCl 2 AlCl 3 + 3 H 2 a. production of 1 mole of H 2 requires 3 moles of HCl; b. production of 1 mole of AlCl 3 requires 3 moles of HCl; c. production of 2 moles of H 2 requires 2 moles of HCl; d. production of 2 moles of H 2 requires 5 moles of HCl. 3. Which of the following nitrogen-containing ions or molecules is theoretically favored in an oxidizing (i.e., potential electron acceptors > potential electron donors) environment? [1 point] a. 2 N b. 3 NO c. 2 NO d. 4 NH + 4. Which of the following solutions contains the least nitrogen (show your work)? [2 points] a. 10 mg/L 3 NO N b. 5.0 x 10 -4 M 3 NO c. 10 mg/L 3 NH N d. 9.0 x 10 -4 M 3 NH 5. What is the hardness of water (in mg/L as CaCO 3 ) with the following composition (all except pH in mM): pH 6.5, Ca 2+ 3.64, Mg 2+ 1.96, Na + 1.31, Cl - 1.03, 3 HCO 3.38, 2 4 SO 5.61? [2 points] 560 mg/L as CaCO 3
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CE 3230 Fall 2007 Quiz #2 1. What is the expression for the reaction quotient (Q) for the following reaction? [2 points] +2 - 2 23 4 2 H S(g) + 8Fe(OH) (s) + 14H SO 8Fe 20H O + ↔+ + 2 2- 2 8 4 14 HS (g ) [SO ][Fe ] Q = P[ H ] + + 2. A reaction is found to conform to the following stoichiometry: A2 B P +→ . What is the rate equation? [2 points] Unable to tell. 3. Which of the following is not true about CO 2 (g)? [2 points] a. CO 2 (g) is an important component in regulating the earth’s climate; b. CO 2 (g) is produced by the combustion of fossil fuels; c. CO 2 (g) has increased significantly in the atmosphere since the industrial revolution; d. CO 2 (g) is produced by photosynthetic organisms. 4. Given the reaction A products and that the reaction is first order, determine the rate constant (with units) from the following data. [2 points] time (sec) 0 10 20 30 50 [A] (mM) 100 48 26 11 3 k = 7.05 x 10 -2 sec -1 5. H 2 S(aq) volatilizes from water to form poisonous hydrogen sulfide gas via the reaction 22 (g) (aq ) H K =0.10 What is the partial pressure (with units) of hydrogen sulfide gas in equilibrium with an industrial wastewater with 5 mg/l of H 2 S(aq) at pH 7? [2 points] P = 1.47 x 10 -3 atm
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CE 3230 Fall 07 Quiz #3 Note: Work any five problems , and clearly indicate with an asterisk (*) which five you want me to grade .
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This note was uploaded on 04/28/2008 for the course CIVL 3230 taught by Professor Barnett during the Spring '08 term at Auburn University.

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Fall 2007 exams - Name (Please write your name on the back...

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