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How to solve any problem involving conversion of units

How to solve any problem involving conversion of units. Final Exam Review. First write down what you know. Then write down what you are looking for. In between them, write “x------- =” On the bottom, write the units of what you know (not the number!).

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How to solve any problem involving conversion of units

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  1. How to solve any problem involving conversion of units Final Exam Review

  2. First write down what you know. Then write down what you are looking for. In between them, write “x------- =” On the bottom, write the units of what you know (not the number!). On the top, write the units of what you are looking for. Find the ratio. Multiply.

  3. A silly example

  4. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make?

  5. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? First write down what you know.

  6. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? First write down what you know. 200 roses

  7. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Then write down what you are looking for. 200 roses

  8. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Then write down what you are looking for. 200 rosesdozens

  9. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Between them, write “x--------- =” 200 rosesdozens

  10. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Between them, write “x--------- =” 200 roses x = dozens

  11. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? On the bottom, write the units of what you know (not the number!) 200 roses x = dozens

  12. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? On the bottom, write the units of what you know (not the number!) 200 roses x = dozens roses

  13. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? On the top, write the units of what you are looking for. 200 roses x = dozens roses

  14. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? On the top, write the units of what you are looking for. dozen 200 roses x = dozens roses

  15. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Find the ratio. dozen 200 roses x = dozens roses

  16. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Find the ratio. 1 dozen 200 roses x = dozens 12 roses

  17. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Multiply. 1 dozen 200 roses x = dozens 12 roses

  18. A florist receives a shipment of 200 long stem roses. How many bundles of a dozen can she make? Multiply. 1 dozen 200 roses x = 16.67dozens 12 roses

  19. A serious example

  20. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab?

  21. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? First write down what you know.

  22. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? First write down what you know. 431 g

  23. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Then write down what you are looking for. 431 g

  24. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Then write down what you are looking for. 431 gmoles

  25. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Between them, write “x--------- =” 431 g moles

  26. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Between them, write “x--------- =” 431 g x = moles

  27. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? On the bottom, write the units of what you know (not the number!) 431 g x = moles

  28. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? On the bottom, write the units of what you know (not the number!) 431 g x = moles g

  29. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? On the top, write the units of what you are looking for. 431 g x = moles g

  30. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? On the top, write the units of what you are looking for. mole 431 g x = moles g

  31. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Find the ratio. mole 431 g x = moles g

  32. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Find the ratio. 1 mole 431 g x = moles 47.9 g

  33. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Find the ratio. 1 mole 431 g x = moles 47.9 g Atomic mass of titanium

  34. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Multiply. 1 mole 431 g x = moles 47.9 g

  35. A slab of titanium has a mass of 431 g. How many moles of titanium atoms are in the slab? Multiply. 1 mole 431 g x = 9 moles 47.9 g

  36. A more complicated example

  37. A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample?

  38. A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? 5 m.AlCl3

  39. A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? g Cl 5 m.AlCl3

  40. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? g Cl 5 m.AlCl3

  41. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? g Cl g Cl 5 m.AlCl3 m.AlCl3

  42. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? Atomic mass of chlorine is 35.45 g Cl g Cl 5 m.AlCl3 m.AlCl3

  43. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? Atomic mass of chlorine is 35.45 There are 3 Cl’s in each AlCl3 g Cl g Cl 5 m.AlCl3 m.AlCl3

  44. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? Atomic mass of chlorine is 35.45 There are 3 Cl’s in each AlCl3 3 x 35.45 = 106.35 g Cl g Cl 5 m.AlCl3 m.AlCl3

  45. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? Atomic mass of chlorine is 35.45 There are 3 Cl’s in each AlCl3 3 x 35.45 = 106.35 106.35 g Cl g Cl 5 m.AlCl3 m.AlCl3 1

  46. x = A bottle contains 5 moles of AlCl3. What is the mass of chloride ion in this sample? Atomic mass of chlorine is 35.45 There are 3 Cl’s in each AlCl3 3 x 35.45 = 106.35 106.35 g Cl g Cl 531.75 5 m.AlCl3 m.AlCl3 1

  47. The same steps work for any kind of conversion problem.

  48. How many atoms of oxygen are in 4 moles of Al2(SO4)3?

  49. How many atoms of oxygen are in 4 moles of Al2(SO4)3? 4m Al2(SO4)3

  50. How many atoms of oxygen are in 4 moles of Al2(SO4)3? 4m Al2(SO4)3 Oatoms

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