University:
Augusta University
Course:
CHEM 1441 | General Chemistry
Academic year:

2022
Views:

255

Pages:

3
Author:

Lanrwst4tn

Mole Conversions Mole: the amount of a substance that contains 6.02 x 1023 respective particles of that substance Avogadro’s number: 6.02 x 1023 Molar Mass: the mass of one mole of an element CONVERSION FACTORS: 1 mole = 6.02 x 1023 atoms 1 mole = atomic mass (g) Try: 1. How many atoms are in 6.5 moles of zinc? 6.5 moles 6.02 x 1023 atoms 3.9 x 1024 atoms = 1 mole 2. How many moles of argon are in a sample containing 2.4 x 10 24 atoms of argon? 2.4 x 1024 atoms of argon 1 mole 6.02 x 1023 atoms = 4.0 mol 1 mole 6.9 g = 0.36 mol 55.8 g 1 mole = 267.84 g = 270g 3. How many moles are in 2.5g of lithium? 2.5 grams Li 4. Find the mass of 4.8moles of iron. 4.8 moles 1 mole = 6.02 x 1023 atoms 1 mole = molar mass (look it up on the PT!) MASS (g) 1 mole = atomic mass (g) 1 mole = 6.02 x 10 23 atoms MOLE PARTICLES (ATOM) Two Step Problems: 1. What is the mass of 2.25 x 1025 atoms of lead? 2.25 x 1025 atoms of lead 1 mole 6.02 x 1023 atoms 207.2g 1 mole = 7744.19g = 7740g = 3.06 x 1022 atoms 2. How many atoms are in 10.0g of gold? 10 g gold 6.02 x 1023 atoms 1 mole 1 mole 197.0g PRACTICE PROBLEMS: 1. How many moles are equal to 625g of copper? 625g of copper 1 mol 64 g Cu = 9.77 mol Cu 2. How many moles of barium are in a sample containing 4.25 x 1026 atoms of barium? 4.25 x 1026 atoms of barium 1 mol = 6.02 x 1023 atoms 706 mol 3. Convert 2.35 moles of carbon to atoms. 2.35 moles 6.02 x 1023 atoms 1 mole = 1.41 x 1024 atoms 4. How many atoms are in 4.0g of potassium? 4.0 g 1 mole 39.1 g 6.02 x 1023 atoms 1 mole = 6.2 x 1022 atoms 1 mole = 6.02 x 1023 atoms 1 mole = atomic mass (g) 5. Convert 9500g of iron to number of atoms in the sample. 9500 g Fe 6.02 x 1023 atoms 1 mole 1 mole 55.8g = 1.0 x 1026 atoms 6. What is the mass of 0.250 moles of aluminum? 0.250 moles 27.0g = 1 mole 6.75 g Al 7. How many grams is equal to 3.48 x 1022 atoms of tin? 3.48 x 1022 atoms 1 mole 6.02 x 1023 atoms 118.7g 1 mole = 6.86 g Sn 8. What is the mass of 4.48 x 1021 atoms of magnesium? 4.48 x 1021 atoms 1 mole 6.02 x 1023 atoms 24.3g 1 mole = 0.181 g Mg or 1.8 x 10-1 9. How many moles is 2.50kg of lead? 2.50kg 1000 g 1 kg 1 mol 207.2 g = 12.1 mol 10. Find the mass, in cg, of 3.25 x 1021 atoms of lithium. 3.25 x 1021 atoms 1 mol 6.02 x 1023 atoms 6.9g 1 mol 100cg 1g = 3.7 cg

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