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Mole Calculation Review

Mole Calculation Review. Objective/Warm-Up. SWBAT perform mole calculations. Explain the picture:. Objective/Warm-Up. SWBAT perform mole calculations. Warm-Up: What is molar mass? What is Avogadro’s number?. Calculate the number of atoms in 54.0 g of aluminum. Ans : 1.20 x 10 24 atoms.

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Mole Calculation Review

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  1. Mole Calculation Review

  2. Objective/Warm-Up • SWBAT perform mole calculations. Explain the picture:

  3. Objective/Warm-Up • SWBAT perform mole calculations. Warm-Up: • What is molar mass? • What is Avogadro’s number?

  4. Calculate the number of atoms in 54.0 g of aluminum. Ans: 1.20 x 1024 atoms

  5. 3.000 moles Na = ______ grams Ans: 68.97 grams

  6. 5.00 moles Na = ________ grams Na Ans: 115 grams

  7. 810. g Cl = _______ moles Cl Ans: 22.8 moles

  8. 3.27 moles of Cl = ____ atoms Cl Ans: 1.97 x 10 24 atoms

  9. Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium? 85.56 amu

  10. 7.7 x 1025 atoms Ni = ____ g Ni Ans: 7.5 x 103 grams

  11. 56 g N = _______ moles N Ans: 4.0 moles

  12. 1.7 moles Ca = _____ grams Ans: 68 grams

  13. Uranium has three common isotopes. If the abundance of 234U is 0.01%, the abundance of 235U is 0.71%, and the abundance of 238U is 99.28%, what is the average atomic mass of uranium? 237.98 amu

  14. 0.033 moles Ne = _______ atoms Ans: 2.0 x 1022 atoms

  15. 9.37 x 1026 atoms Ag = __ moles Ans: 1.56 x 103 moles (or 1560 moles)

  16. 6.00 moles of Al = ______ atoms Ans: 3.61 x 1024 atoms

  17. Titanium has five common isotopes: 46Ti (8.0%), 47Ti (7.8%), 48Ti (73.4%), 49Ti (5.5%), 50Ti (5.3%). What is the average atomic mass of titanium? 47.92 amu

  18. 120. grams O = ___ atoms Ans: 4.52 x 1024 atoms

  19. 51 grams Zn = ______ moles Ans: 0.79 moles

  20. 1.2 x 1024 atoms C = ___ moles Ans: 2.0 moles

  21. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu. Calculate the atomic mass of 65Cu. 65Cu = 64.9278 amu

  22. 6.0 moles H = _____ grams Ans: 6.0 grams

  23. 57.9 grams Ne = _________ atoms Ans: 1.73 x 1024 atoms

  24. 24Mg (78.70%), 25Mg (10.13%), and 26Mg (11.7%). The average atomic mass of the three isotopes is 24.3050 amu. If the atomic mass of 25Mg is 24.98584 amu, and 26Mg is 25.98259 amu, calculate the actual atomic mass of 24Mg. 24Mg = 23.80 amu

  25. 8.56 x 1021 atoms = ______ g S Ans: 0.456 g S

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