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CH 201 Lecture 05-S

# CH 201 Lecture 05-S - two things 1 The mass of one atom(in...

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CH 201 Tuesday, October 17 “Chemical Formulas”

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Announcements Exam 1 Thursday! Bring 3 items: Calculator #2 pencil OSU Student ID Quiz scores: Software problems are preventing posting at present; stay tuned…
Moles What is the atomic mass of carbon? 12.01 amu How many atoms of carbon would we need to have a mass of 12.01 grams ? What is the atomic mass of phosphorus? 30.97 amu How many atoms of phosphorus would we need to have a mass of 30.97 grams ? This number never changes—it is one mole

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One mole… …is the number of particles it takes to have a mass in grams equal to the individual particle’s mass in amu …is always the same number (6.02 x 10 23 ) “Avogadro’s Number” …may be applied to anything (atoms, ions, molecules, pencils, termites…)
More questions… How much mass is contained in one mole of nitrogen atoms? How much mass is contained in ½ mole of N atoms?

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Moles and the Periodic Table Atomic masses (from the Periodic Table) tell you

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Unformatted text preview: two things: 1) The mass of one atom (in amu) 2) The mass of one mole of atoms (in grams) These are both ratios , which can be used to solve problems atom amu grams mole of atoms Mass, Moles, and Particles MOLES MASS # PARTICLES (atoms, molecules) (grams) Per. table 6.02 x 10 23 Empirical Formulas An empirical formula is the simplest ratio of atoms in a compound It is found by experiment Not necessarily = molecular formula Example: CH 2 O How is it found? Sugar cane Empirical Formulas We can find the empirical formula of a compound from its % composition Allicin is what gives garlic its smell. It is 44.4% carbon, 6.21% hydrogen, 39.5% sulfur, and 9.86% oxygen. What is its empirical formula? Is this the molecular formula?? Finding Molecular Formulas If the molecular mass of allicin is 162 g/mol, what is its molecular formula?...
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CH 201 Lecture 05-S - two things 1 The mass of one atom(in...

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