mod 4 mole.pptx
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This document discusses the mole concept and determining percentage composition of compounds. It defines the mole as containing 6.02x1023 particles, which can be atoms, molecules, or formula units, and that one mole of different substances will have different masses. It provides the relationships between mass, moles, and number of particles. It explains that percentage composition is found by taking the mass of each element, dividing by the molar mass of the compound, and multiplying by 100 to find the percentage each element represents of the total mass.
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This document discusses the mole concept in chemistry. It defines key terms like mole, molar mass, relative atomic mass, and Avogadro's number. The main points are:
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- 2. Module 4: What’s in a MOLE 1. How is the mole used to express the mass of a substance? 2. How is the percentage composition of a given compound determined? Objectives: • use the mole concept to express mass substances; and • Determine the percentage composition of a compound given its chemical formula and vice versa
- 3. Given the SI symbol mol and is equivalent to Avogadro’s number, 6.02X1023 particles Particles can be atoms, molecules, or formula units. One mole of different substances always contains 6.02X1023 particles but each of these substances has a different mass Lorenzo Romano Amedeo Carlo Avogadro (1776-1856), Italian scientist First suggested that it might be possible to count atoms Established a law stating that equal volumes of gases contain the same number of molecules at the same temperature and pressure. MOLE
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