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Unformatted text preview: Counting Atoms
Chemistry is a quantitative science—we need a “counting unit.” MOLE
1 mole is the amount of substance that contains as many particles (atoms, molecules) as there are 12 in 12.0 g of 12C. in Particles in a Mole
Amadeo Avogadro 1776-1856 NA = 6.0221 x 1023/mol 6.0221
*There is Avogadro’s number of particles in a mole of any substance. CHAPTER 1
Atoms: The Quantum World Observing Atoms
Spectroscopy: the analysis of the light emitted or absorbed by substances. Spectrum of Excited Hydrogen Gas Light is Electromagnetic Radiation
• Electromagnetic radiation = a wave of electric and magnetic fields
– ALL electromagnetic radiation travels at...
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