Chapter 4 Lecture

Chapter 4 Lecture - Chapter 4 Chemical Composition...

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Chemical Composition Chapter 4
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Questions for consideration 1. How can we count the number of atoms in a sample of a material? The number of molecules? The number of formula units? 2. How can we know the number of molecules in a sample of a material? 3. How can we use the masses of elements in a compound to determine its chemical formula? 4. How can we express the composition of a solution?
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Math tools used 1. Scientific notation 2. Units and conversions
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mole(mol) - the amount of a substance that contains the same number of entities as there are atoms in exactly 12 g of carbon-12. This amount is 6.022x10 23 . The number is called Avogadro’s number and is abbreviated as N. One mole (1 mol) contains 6.022x10 23 entities (to four significant figures)
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Molar Mass • Mass of 1 mol of a substance – Different for every compound • Numerically equivalent to formula mass • Units of gram/mole • Can be used to convert between moles and mass
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Water 18.02 g CaCO 3 100.09 g Oxygen 32.00 g Copper 63.55 g One mole of common substances.
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Information Contained in the Chemical Formula of Glucose C 6 H 12 O 6 ( M = 180.16 g/mol) Oxygen (O) Mass/mole of compound 6 atoms 96.00 g Carbon (C) Hydrogen (H) Atoms/molecule of compound Moles of atoms/ mole of compound Atoms/mole of compound Mass/molecule
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Chapter 4 Lecture - Chapter 4 Chemical Composition...

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