L03S08 SolutionReactions - Chem 1A , L3: Solution Reactions...

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Unformatted text preview: Chem 1A , L3: Solution Reactions Bulk Matter Lab 2: Avogadro's Number Goal: Measure a value of Avogadro's number by using a compound of known mass to "estimate" the number of molecules in a monolayer. Tools: Information such as molar mass, molecular geometry and density will be used to help you measure Avogadro's number. L3-1 2002 M. Kubinec Mass Spectrometer Ionization - N Magnet Mass Spectrum Sample Acceleration S 1 H 2H 2, 1H 12C 16 O 13C 16O 2 1H 16O 18O 2 , 16O18O 12C16O 2 1H2H 3He , 13C16O 2 0 10 20 30 18O 2 40 50 L2-5 2000 A.Pines M.Kubinec UCB Relative Atomic and Molecular Mass H 1.01 12C Empirical and Molecular Formula Methane Ethylene CH 4 CH2 CH4 C2H8 C3H12 CH2 C2H4 C3H6 CH C2H2 C3H3 L3-2 L2-10 Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 L2-5 12.00 C 12.01 O 16.00 2000 A.Pines M.Kubinec UCB Acetylene CH 2000 A.Pines M.Kubinec UCB 2002 M. Kubinec ChemQuiz 2.1 An equimolar mixture of oxygen atomic isotopes forms oxygen molecules. Which is molecules. the correct O2 spectrum? O O 16 O 16 O 18 18 O O 18 16 16 O O 18 O O 16 18 A) 32 34 36 B) 32 34 36 C) 32 34 36 2002 M. Kubinec L3-3 2003 M.Kubinec Chem 1A , L3: Solution Reactions Bulk Matter ChemQuiz 2.2 Combustion of a hydrocarbon with O2 yields products with the mass spectrum shown. Which is the hydrocarbon? hydrocarbon? 18 44 A) CH4 Methane 2002 M. Kubinec B) C2H4 Ethylene C) C2H2 Acetylene L3-5 Empirical and Molecular Formula Methane Ethylene CH4 CH2 CH4 C2H8 C3H12 CH2 C2H4 C3H6 CH C2H2 C3H3 L3-7 Acetylene CH 2002 M. Kubinec 30g of phosphorous react with 40 g oxygen gas to form an oxide. What is the emperical formula of the oxide? P ChemQuiz 2.3 Molar Masses P = 31 g/mol O = 16 g/mol O2 A) PO2 B) P2O5 C) P3O4 2002 M. Kubinec L3-8 2003 M.Kubinec Chem 1A , L3: Solution Reactions Bulk Matter Density of Gases CH3CH2CH2OH = molar density (all gases) = mass density (MW are equal) mass density = 0.0027 g/ml H O CH3CHCH3 2002 M. Kubinec L1-8 Combustion of Alcohols CH3CH2CH2OH + 9/2 O2 3 CO2 + 4 H2O MM Density (g/ml) gas liquid Reactions in Solution Concentration in Molar (M) 1 mole solute 1M = Liter solution What is [propanol] when 60 ml propanol] propanol is mixed with 40 ml H2O? A) > 1 M 2002 M. Kubinec Propanol CH3CH2CH2OH 60 Isopropanol Ethanol LD50 ~ 6g/kg 2002 M. Kubinec (g/mol) OH CH3CHCH3 0.003 0.80 0.003 0.78 0.002 0.94 L3-10 60 46 CH3CH2OH B) ~ 1 M C) < 1 M L3-10 L1-15 2002 M. Kubinec Density of Gases CH3CH2CH2OH CH3CH2CH2OH 0.80 g/ml liquid = molar density (all gases) = mass density (MM are equal) mass density = 0.0027 g/ml H O CH3CHCH3 2002 M. Kubinec L3-11 Density of Liquids different condensed volumes (liquid) CH3CH2CH2OH 0.80 g/ml liquid = molar density (liquids) = mass density (even though MM are equal) H O CH3CHCH3 0.78 g/ml liquid 2002 M. Kubinec L3-12 2003 M.Kubinec Chem 1A , L3: Solution Reactions Bulk Matter Combustion of Alcohols CH3CH2CH2OH + 9/2O2 3 CO2 + 4 H2O MM Density (g/ml) gas liquid Propanol CH3CH2CH2OH 60 Isopropanol CH3CHCH3 OH 60 (g/mol) 0.003 0.80 0.003 0.78 2002 M. Kubinec L3-13 ChemQuiz 3.1 Which produces the greater volume of CO2 when 1 g of each liquid is burned? 1) Propanol 2002 M. Kubinec 2) Isopropanol 3) Same L3-14 ChemQuiz 3.2 Which produces the greater volume of CO2 when 1 L of each gas is burned? A) Propanol 2002 M. Kubinec B) Isopropanol C) Same L3-16 2003 M.Kubinec Chem 1A , L3: Solution Reactions Bulk Matter Combustion of Alcohols CH3CH2CH2OH + 9/2 O2 3 CO2 + 4 H2O MM Density (g/ml) gas liquid Propanol CH3CH2CH2OH 60 Isopropanol CH3CHCH3 Ethanol LD50 ~ 6g/kg 2002 M. Kubinec (g/mol) OH 0.003 0.80 0.003 0.78 0.002 0.94 L3-18 60 46 CH3CH2OH ChemQuiz 3.3 Which produces the greater volume of CO2 when 1 ml of each liquid is burned? A) Propanol 2002 M. Kubinec B) Isopropanol C) Same L3-19 Reactions in Solution Concentration in Molar (M) 1 mole solute 1M = Liter solution What is [propanol] when 60 ml propanol] propanol is mixed with 40 ml H2O? 2002 M. Kubinec L3-21 2003 M.Kubinec Chem 1A , L3: Solution Reactions Bulk Matter Reactions in Solution What is [propanol] when 60 ml propanol] propanol is mixed with 40 ml H2O? 60 ml propanol ~ 60 x 0.8 g/ml = 48 g 60 g ~ 1 mole 48 g ~ 0.8 mole ~ 0.8 mole/0.1 L ~ 8 M 2002 M. Kubinec L3-22 ChemQuiz 3.4 What is the molar concentration of ethanol in a 90 proof whisky? A) ~ 2 M 2002 M. Kubinec B) ~ 5 M C) ~ 10 M L3-23 Lecture Complete 2002 M. Kubinec L3-25 2003 M.Kubinec ...
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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