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Understanding Mass-Particle Conversions and Mole Calculations in Chemistry

This guide explores mass-particle conversions and mole calculations essential for chemistry students. Learn how to determine the number of atoms in a given mass of a substance, such as calculating how many atoms of gold are in 25.0 g. It also covers how to convert between the number of atoms and grams for helium and the moles of compounds like Freon (CCl2F2). Examples included demonstrate finding moles of fluorine in CCl2F2 and identifying chloride ions in aluminum chloride (AlCl3), enhancing your understanding of these fundamental concepts.

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Understanding Mass-Particle Conversions and Mole Calculations in Chemistry

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  1. The MolePart 2

  2. Mass – Particle Conversions • How many atoms of gold are in 25.0 g of gold?

  3. Mass – Particle Conversions • How many grams of He are in 5.50 x 1022 atoms of He?

  4. Moles of Compounds • Freon has the formula CCl2F2 • This now gives us new conversion factors

  5. Example • How many moles of F are in 5.50 mol of CCl2F2?

  6. Example • How many moles of Al are in 1.25 mol of Al2O3?

  7. Example • How many Cl- ions are in 35.6 g of AlCl3? • How many Al +3 ions?

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