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Chapter 3 -lecture 2

Chapter 3 -lecture 2 - General Chemistry I Fall 2007 Joann...

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General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang
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MOLECULAR WEIGHT & MOLECULAR WEIGHT &  MOLAR MASS  MOLAR MASS Molecular weight Molecular weight = = sum of the atomic weights of all atoms sum of the atomic weights of all atoms in the molecule. in the molecule. Molar mass Molar mass = molecular weight in grams = molecular weight in grams (g/mol) (g/mol)
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1 mol contains: 1 mol contains: 2 mol C (12.01 g C/1 mol) = 24.02 g C 2 mol C (12.01 g C/1 mol) = 24.02 g C 6 mol H (1.01 g H/1 mol) = 6.06 g H 6 mol H (1.01 g H/1 mol) = 6.06 g H 1 mol O (16.00 g O/1 mol) = 16.00 g O 1 mol O (16.00 g O/1 mol) = 16.00 g O TOTAL = TOTAL = molar mass   =  46.08 g/mol molar mass   =  46.08 g/mol + Kotz &Treichel Chemistry & Chemical Reactivity 5th ed.
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Formula = Molar mass = Tylenol Tylenol 151.18 g/mol 151.18 g/mol Kotz &Treichel Chemistry & Chemical Reactivity 5 th ed.
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Molar Mass Molar Mass Kotz &Treichel Chemistry & Chemical Reactivity 5th ed.
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Clicker Question What is the molar mass for glucose, C 6 H 12 O 6 ?
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Stepwise Conversions Mass, g Moles Molecules Number of Atoms molar mass Avogadro’s # subscripts from formula
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How many  How many  moles moles  of alcohol are there in a   of alcohol are there in a  “standard” can of beer if there are 21.3 g of  “standard” can of beer if there are 21.3 g of  C C 2 2 H H 6 6 O? O? (a) Molar mass of C H O = 21.3 g • 1 mol 46.08 g = 0.462 mol 46.08 g/mol Kotz &Treichel Chemistry & Chemical Reactivity 5th ed.
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How many How many molecules molecules of alcohol are of alcohol are there in a “standard” can of beer if there in a “standard” can of beer if there are 21.3 g of C there are 21.3 g of C 2 2 H H 6 6 O? O? = 2.78 x 10 molecules We know there are 0.462 mol of C 2 H 6 O . 0.462 mol • 6.022 x 10 23 molecules 1 mol Kotz &Treichel Chemistry & Chemical Reactivity 5th ed.
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How many How many atoms of C atoms of C are there in a are there in a “standard” can of beer if there are “standard” can of beer if there are 21.3 g of C 21.3 g of C 2 2 H H 6 6 O? O? = 5.57 x 10 C atoms There are 2.78 x 10 23 molecules. Each molecule contains 2 C atoms.
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