chapter 20
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Chapter 20. Concentration. Molarity (M). Moles of solute per liter of solution. moles of solute. Molarity =. liters of solution. What is the molarity of a solution prepared by dissolving 21.0 g of CaCl 2 in 500.0 mL of solution?. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 20
Concentration
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Molarity (M)
• Moles of solute per liter of solution.
Molarity =moles of soluteliters of solution
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What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 21.0 g of CaCldissolving 21.0 g of CaCl22 in 500.0 mL of solution? in 500.0 mL of solution?
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What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 21.0 g of CaCldissolving 21.0 g of CaCl22 in 500.0 mL of solution? in 500.0 mL of solution?
0.378M CaCl2
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What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 48.4 g of CaCldissolving 48.4 g of CaCl22 in 100.0 mL of solution? in 100.0 mL of solution?
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What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 48.4 g of CaCldissolving 48.4 g of CaCl22 in 100.0 mL of solution? in 100.0 mL of solution?
4.36M CaCl2
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molality (m)
• Moles of solute per kilogram of solvent.
molality =moles of solute
kg of solvent
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What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 92.3 g of KF in 100.0g of water? dissolving 92.3 g of KF in 100.0g of water?
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What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 92.3 g of KF in 100.0g of water? dissolving 92.3 g of KF in 100.0g of water?
15.9m KF
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What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 20.0g of NHdissolving 20.0g of NH44Cl in 400.0g of water? Cl in 400.0g of water?
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What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 20.0g of NHdissolving 20.0g of NH44Cl in 400.0g of water? Cl in 400.0g of water?
0.935m NH4Cl
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Mole Fraction (X)
• moles of component per total moles of solution.
mole fraction =moles of component
total moles in solution
Note: The mole fractions of the solute and solvent add up to “1”
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What is the mole fraction of CWhat is the mole fraction of C44HH1010O in a solution O in a solution
containing 75.6g of Ccontaining 75.6g of C1010HH88 and 600.0g of C and 600.0g of C44HH1010O? O?
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What is the mole fraction of CWhat is the mole fraction of C44HH1010O in a solution O in a solution
containing 75.6g of Ccontaining 75.6g of C1010HH88 and 600.0g of C and 600.0g of C44HH1010O? O?
XC4H10O = 0.932
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What is the mole fraction of CWhat is the mole fraction of C22HH66O in a solution O in a solution
containing 67.4g of Ccontaining 67.4g of C99HH77N and 200.0g of CN and 200.0g of C22HH66O? O?
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What is the mole fraction of CWhat is the mole fraction of C22HH66O in a solution O in a solution
containing 67.4g of Ccontaining 67.4g of C99HH77N and 200.0g of CN and 200.0g of C22HH66O? O?
XC2H6O = 0.893
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Percent Solution by mass
• Represents the number of grams of solute per 100 grams of solution.
% solution = mass of solutemass of solution
X 100
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A solution contains 130g of HCl in 750g of water. A solution contains 130g of HCl in 750g of water. What is the percent by mass of this HCl solution?What is the percent by mass of this HCl solution?
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A solution contains 130g of HCl in 750g of water. A solution contains 130g of HCl in 750g of water. What is the percent by mass of this HCl solution?What is the percent by mass of this HCl solution?
14.8% HCl
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What is the mass percent of a solution What is the mass percent of a solution containing 67.4g of Ccontaining 67.4g of C99HH77N in 200.0g of CN in 200.0g of C22HH66O? O?
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What is the mass percent of a solution What is the mass percent of a solution containing 67.4g of Ccontaining 67.4g of C99HH77N in 200.0g of CN in 200.0g of C22HH66O? O?
25.2% C9H7N
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Homework
• Worksheet: Concentration