Mole conversions
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Moles can be converted to grams, particles, and other units using dimensional analysis. To convert between moles and grams, divide the mass by the molar mass. To convert between moles and particles, multiply or divide by Avogadro's number. Dimensional analysis keeps track of units and is important for stoichiometry calculations. Practice problems provide examples of converting between moles, grams, and particles for different compounds.
Mole conversions
- 1. MOLE CONVERSIONSUnit 7: The Mole
- 2. WHY DO WE NEED TO CONVERT MOLES? • Moles can be converted to find the number of grams or the number of particles in a sample. • If you have moles, grams, or particles you can convert it to another unit. • Particles can be atoms (single element), molecules (covalent compound), or formula units (ionic compound)
- 4. WHAT ARE THE CONVERSIONS? • Mass Moles – divide by molar mass • Particles Moles – multiply by Avogadro’s number • Particles Mass – divide by Avogadro’s number; multiply by molar mass
- 5. WHAT IS DIMENSIONALANALYSIS? • Dimensional analysis is a way of organizing calculations to keep track of units. • You must show your work this way – if you get used to it now, stoichiometry (next unit) will be easier!
- 6. PRACTICE • How many moles are in 45.98 g of Na?
- 7. PRACTICE • How many particles are in 2 moles of NaCl?
- 8. PRACTICE • How many grams are in 6.02x1023 molecules of water?
- 9. PRACTICE • How many moles are in 8.91x1024 atoms of magnesium?