Use the chart to answer the question. A family chooses to eat lentils instead of beef for dinner to reduce the family's impact on the environment. The chart support this reasoning because raising beef for food requires water than lentils. Using more water has a v impact on the environment because water is an important and often scarce resource.

Use the chart to answer the question. A family chooses to eat lentils instead of beef for dinner to reduce the family's impact on the environment. The chart support this reasoning because raising beef for food requires water than lentils. Using more water has a v impact on the environment because water is an important and often scarce resource.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter10: Solutions

Section: Chapter Questions

Problem 66QAP: The Henry's law constant for the solubility of radon in water at is 9.57106 M/mm Hg. Radon is...

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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 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 MgCO3 and assuming a temperature of 27C, 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.)
Some water dissolves in liquid methane at -161°C to givea solution in which the mole fraction of water is 6.0 × 10-5. Determine the mass of water dissolved in 1.00 L ofthis solution if the density of the solution is 0.78 g cm-3.
CO2 in water has a Henry’s law constant KB = 1.25 × 106 torr. How many liters of CO2 are needed to make 1 liter of sparkling water at 1 atm and 300 K? The density of water is 1 kg/L and it does not change as CO2 is dissolved. N.B. Treat gas as a solute, and note that in order for water to “sparkle” the partial pressure of CO2 in the vapor phase must equal the atmospheric pressure (note that this neglects the partial pressure of the water vapor).
1.) Are there any intermolecular forces (IMF’s) between water molecules and cyclohexane molecules? What kind(s)? Given this, what would the magnitude and sign of DHMIXING be for cyclohexane dissolving in water? a) Are there any IMF’s between water molecules and other water molecules? What kind(s)? Given this, what would the magnitude and sign of DHSOLVENT be for cyclohexane dissolving in water? c) Are there any IMF’s between cyclohexane molecules and other cyclohexane molecules? What kind(s)? Given this, what would the magnitude and sign of DHSOLUTE be for cyclohexane dissolving in water? d) Why do you think cyclohexane does not dissolve in water? Analyze this the way it was done in class, thinking about the three contributions to DHSOLUTION. What do you think the magnitude and sign of DHSOLUTION would be for dissolving cyclohexane in water? (Explain.) Would you expect these substances to dissolve in each other? Why?
Sodium chloride, the table salt (NaCl) is added in cooking to enhance the flavor of the food. When 10.0 g of NaCl are added in 200.0 mL of water at 25.0oC in a coffee-cup calorimeter, 669 J of heat are absorbed. (Assume that there is no change in volume, d=1.00 g/mL, specific heat=4.18 J/g.oC). Evaluate the truthfulness of this statement: "Based on the above description, the solution process (i.e., the dissolution of NaCl or the breakdown of NaCl into its constituent ions) is exothermic." True False
The Ogallala aquifer described in the Closer Look box in, provides 82% of the drinking water for thepeople who live in the region, although more than 75% ofthe water that is pumped from it is for irrigation. Irrigationwithdrawals are approximately 18 billion gallons per day.(a) Assuming that 2% of the rainfall that falls on an areaof 600,000 km2 recharges the aquifer, what average annualrainfall would be required to replace the water removed forirrigation? (b) What process or processes accounts for thepresence of arsenic in well water?
What is the concentration of O2 in freshwater? Air temperature= 295.65 K. Air pressure = 1 bar(about = to 1atm). Henry's constant, from the table= 1.3 x 10-3 mol/ (kg x bar). PO2 can be calculated from the fact that oxygen is .21 mole fraction of air. Hint- The partial pressure of a gas in a mix of gasses is found by multiplying the total pressure by the mole fraction of that gas. Find the concentration in g/kg from the answer you just got.
Calculate the mass of oxygen dissolved in 130.0 LL of water at 25 ∘C∘C at a total pressure of 1 atmatm and a mole fraction for oxygen of 0.212. The Henry's law constant for oxygen at 25 ∘C∘C is 1.3×10−3M/atm1.3×10−3M/atm.
Osmotic pressures are often reported in units of atmospheres or mm Hg. The latter impliesthat the height of a column of liquid can be used as a measure of pressure. This is, in fact, thebasis of the torricellian barometer from which the units of “torr” come. The pressure, P, isrelated to the height of the column by:P = ρghwhere ρ is the density of the liquid, g is the acceleration due to gravity and h is the height. Whatwill be the height (in mm) of a column of aqueous solution with a density of 0.9987 g/mL, if theosmotic pressure of the solution at 25 °C is 1.4 mm Hg? The density of mercury at thistemperature is 13.8 g/mL
The Safe Drinking Water Act (SDWA) sets a limit for mercury—a toxin to the central nervous system—at 0.0020 ppm by mass. Water suppliers must periodically test their water to ensure that mercury levels do not exceed this limit. Suppose water becomes contaminated with mercury at twice the legal limit (0.0040 ppm). How much of this water would a person have to consumeto ingest 50.0 mg of mercury?
Ascorbic acid 1vitamin C, C6H8O62 is a water-soluble vitamin.A solution containing 80.5 g of ascorbic acid dissolvedin 210 g of water has a density of 1.22 g>mL at 55 °C. Calculate(a) the mass percentage, (b) the mole fraction, (c) themolality, (d) the molarity of ascorbic acid in this solution.
The Earth’s oceans have a salinity of 35. What is the concentrationof dissolved salts in seawater when expressed inppm? What percentage of salts must be removed from seawaterbefore it can be considered freshwater (dissolved salts< 500 ppm)?