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Class notes CHEM 101

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General chemistry notes covering moles, stoichiometry, conversions, and limiting reagents including examples

Institution
Colgate University
Course
CHEM 101








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Institution
Colgate University
Course
CHEM 101
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August 21, 2024
Number of pages
3
Written in
2022/2023
Type
Class notes
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Peeler
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W2 MondayLecture
Yoles
Mole mol 6.022 10 things
things formulaunitsatomsmoleculesionsetc
60221023 Avogadro'snumber
a dozen is a convenientunitforeggsandbagelswhile a moleisconvenientforformulaunits

MolarMass
Molarmass the ofgramsneededtomakeup 1mole of aformulaunit units ofgmol
I carbonatomis 12.010 1.66 1026kg Atomic
I mole ofCarbonatoms 6.022 1023atoms 1.66 1021kg 12.01g
Symbo
atom of C is 12.014
1 mole of C is 12.01g name
mass
YolarMassof Molecule
The sum of themolarmassesof theatomsinthemoleculefound onperiodictable
Molarmass of Na103
Na 22 989770 gmol
I 126.90447 gmol
03 3 15.9994 g mo
197.89g mol

ConvertingBetween GramsandMoles
Dimensionalanalysis
using molarmasscanconvertbetweengramsandmoles
Howmanymoles in 197.4g of Se

191.4
781
6s 2500m01
Howmany grams in 2.500 mol ofSe

2500m01 I 197.4g

Example1 Calculatethenumberofmoles in 250.0mLof ethanol CHCHOH
ewitha density of0.76gmL
250.0m 9m 46 68448 4.124mol
190.0g 190.0
C2 H6 01
2 12.0107 24.0214 4 Mol
6 1.00794 6.04764
1 15.9994 15.9994
46.06844
91m01



Stoichiometry
MolarRatios
usedtoconvert betweenelementscompound
can beextractedfromthecoefficientsof a balancedchemicalequation
2 Na s Cla g 2NaCl s
2molsofNasolidreactw ImolofClagastoproduce2molsofNaClsolid
Stoichiometry
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