CH116lecture9-addendum

CH116lecture9-addendum - UMass Boston, Chem 116 Density in...

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UMass Boston, Chem 116 ©H.Sev ian 1 Concentration in Solutions PURE SUBSTANCES (Call it Density) Gases: 2 ways to express z Particle density z How many particles (moles) in 1L z Mass density z Mass (grams) of particles in 1L 1 way to express z Mass density z Mass (g) of particles in 1L MIXTURES (Call it Concentration) Solutions: 4 ways to express z 3 kinds of “particle density” z Molarity: how many moles of solute in 1L of solution (total volume of the mixture) z Molality: how many moles of solute in 1 kg of solvent z Mole fraction: fraction of moles of each substance in the total moles z 1 kind of “mass density” z Weight percent: fraction of grams of one substance in the total number of grams of all substances Density = How much stuff in a particular amount of space Concentration in solutions (liquids) z Remember that “solution” is the term used to mean “mixture” that’s in a liquid phase z
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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CH116lecture9-addendum - UMass Boston, Chem 116 Density in...

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