LQ 1-26 thru 2-14-06

# LQ 1-26 thru 2-14-06 - LQ Thursday The maximum content of...

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Unformatted text preview: LQ. Thursday 1-26-06 The maximum content of Cl- in domestic water should be 25 mg per 100 mL. What is the molarity of Cl- ? (Atomic weight: Cl = 35.45). 7 . 1 x 1- 1 7 . 1 x 1- 3 5 . x 1- 3 2 . 5 x 1- 3 2 . 5 x 1- 1 16% 76% 1% 4% 3% 1. 7.1 x 10-1 2. 7.1 x 10-3 answer 3. 5.0 x 10-3 4. 2.5 x 10-3 5. 2.5 x 10-1 A solution contains 0.0500 g of toluene (C 7 H 8 ) and 225.00 g of benzene and has a density of 0.870 g/mL. How many ppm of toluene are there in this solution? What is the molarity of this solution? 1. 222 ppm, 2.10 x 10-6 M 2. 2.22 x 10 2 ppm, 0.00210 M 3. 2.22 x 10-4 ppm, 2.10 x 10-3 M 4. 2.22 ppm, 1.93 x10 2 M Answer: #2 Since the vapor pressure of water is 23.8 Torr @ 25 degrees C, and glycerin (C 3 H 8 O 3 ) is nonvolatile, one can predict the total vapor pressure above a water-glycerin solution rather simply. (The density of glycerin is 1.26 g/mL) Question: If you added 100 mL of glycerin to 500 mL of water @ 25 degrees C, what is the total vapor pressure in Torr above this solution? . 9 5 3 1 . 3 7 2 2 . 7 2 3 . 8 25% 25% 25% 25% 1. 0.953 2. 1.37 3. 22.7 4. 23.8 Answer: #3 What is the instantaneous rate of disappearance of C 4 H 9 Cl at time = 600 seconds?Cl at time = 600 seconds?...
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## This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.

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LQ 1-26 thru 2-14-06 - LQ Thursday The maximum content of...

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