In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 μ g of dissolved solids per milliliter. Reverse osmosis units are marketed in this area to soften water. A typical unit exerts a pressure of 8.0 atm and can produce 45 L water per day. a. Assuming all of the dissolved solids are MgCO 3 and assuming a temperature of 27°C, what total volume of water must be processed to produce 45 L pure water? b. Would the same system work for purifying seawater? (Assume seawater is 0.60 M NaCl.)
In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 μ g of dissolved solids per milliliter. Reverse osmosis units are marketed in this area to soften water. A typical unit exerts a pressure of 8.0 atm and can produce 45 L water per day. a. Assuming all of the dissolved solids are MgCO 3 and assuming a temperature of 27°C, what total volume of water must be processed to produce 45 L pure water? b. Would the same system work for purifying seawater? (Assume seawater is 0.60 M NaCl.)
Solution Summary: The author explains that the total volume of water must be calculated to predict if the same system would work for purifying seawater. The osmotic pressure can be given by the equation.
In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 μg of dissolved solids per milliliter. Reverse osmosis units are marketed in this area to soften water. A typical unit exerts a pressure of 8.0 atm and can produce 45 L water per day.
a. Assuming all of the dissolved solids are MgCO3 and assuming a temperature of 27°C, what total volume of water must be processed to produce 45 L pure water?
b. Would the same system work for purifying seawater? (Assume seawater is 0.60 M NaCl.)
5.
Please consider the Newman projection of tartaric acid drawn below as an eclipsed
conformer (1). Please draw the most stable conformer and two intermediate energy conformers
noting that staggered conformers are lower in energy than eclipsed forms even if the staggered
conformers have gauche relationships between groups. [Draw the substituents H and OH on the front
carbons and H, OH and CO₂H on the back carbons based on staggered forms. -CO₂H is larger than -OH.]
OH
COH
ICOOH
COOH
COOH
1
2
COOH
COOH
3
4
Staggered
Staggered
Staggered (most stable)
Indicate the number of each conformer above (1, 2, 3 and 4) that corresponds to the relative energies
below.
Ref=0
Rotation
6. (60 points)
a. Are compounds 1 and 2 below enantiomers, diastereomers or identical?
OH
OH
HO
HO
LOH
HO
HO
OH
2
OH
OH
b. Please complete the zig-zag conformation of the compound
(3R,4S)-3,4-dichloro-2,5-dimethylhexane by writing the respective atoms in the boxes.
3.
The plutonium isotope with 144 neutrons
Enter the chemical symbol of the isotope.
The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride produced 26.1 gg of sodium upon decomposition. How much fluorine was formed?
Biochemistry: Concepts and Connections (2nd Edition)
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