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Unformatted text preview: 100 % formula mass % N? % O? 6 Counting Atoms, Ions and Molecules Consider various reactions forming CO where: 1 atom of C combines with 1 atom of O to give CO, 1 pair of C atoms + 1 pair of O atoms gives 1 pair of CO molecules 1 dozen C atoms + 1 dozen O atoms gives 1 dozen CO molecules 1 gross of C atoms + 1 gross of O atoms gives 1 gross CO molecules 1 mole of C atoms + 1 mole of O atoms gives 1 mole of CO molecules 1 mole = 6.022137 x 10 23 objects Avogadros number 7 The Mole s One mole is the amount of a substance that contains as many elementary units as there are 12 6 C atoms in exactly 12.00000 g of 12 6 C 8 Converting between Moles and number of particles How many atoms are in 1.50 moles of carbon? How many molecules are in 5.35 moles of CO? Moles of substance Particles of a substance...
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- Spring '11