Molar mass

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Molar mass

  1. 1. The relationship between thenumber of moles of a substance with its mass
  2. 2. Molar Mass Relate to Avogadro ConstantMeaning
  3. 3. Mass Amount of substance 50 g of 2 kg of flower mangosteen 3 kg of papaya
  4. 4. Molar massMass of one mole of element orcompound in gram Unit Gram per mol (g/mol)
  5. 5. MOLAR MASS OF AN ELEMENT is found by looking at the atomic mass of the element on the periodic tableMolar mass = (RAM) Relative Atomic Mass = (RMM) Relative Molecular Mass
  6. 6. Cobalt = 59g Bromine = 80g 1 mole elementIron = 56 g Calcium = 40 g
  7. 7. MOLAR MASS OF A CHEMICAL COMPOUND Molar masses of chemical compounds are equal to the sums of the molar masses of all the atoms in one molecule of that compoundexample : NaCl molar mass = molar mass of one atom of sodium + molar mass of one atom of chlorine Answer : 58.5 g
  8. 8. EXAMPLE OF CHEMICAL COMPOUND Sodium Chloride, NaCl 23g of sodium + 35g of chloride =58 g Water, H2O 2g hydrogen + 16g oxygen = 18g
  9. 9. MOLAR MASS RELATION TO AVOGADRO CONSTANT Molar mass = 1 mol mass 1 mol = 6.02 X 1023Molar mass = mass of 6.02 X 1023
  10. 10. EXAMPLE 1 mole Aluminum Relative atomic mass1 mol Aluminum has a mass of 27 g1 mol of Aluminum contain 6.02 X 1023 atoms6.02 X 1023 Atom of Aluminum has mass of 27g
  11. 11. sulfur water1 mole - 32 g 1 mole - 18 g copper 1 mole - 64 gAll this substance contain 6.02 X 1023
  12. 12. Building of a houseOne mole of nails contains 6.022 x 1023 nailsOne mole of screws contains 6.022 x 1023 screwsOne mole of woods contains 6.022 x 1023 woods
  13. 13. 1 Mol = 6.02 X 10 23SUBSTANCE He NaCl H 2O mol 1 2 3 Mass (g) 4.0 x 1 18.0 x 2 58.5 x 3 6.02 X 1023 6.02 X 1023 6.02 X 1023 NA x 1 x 2 x 3

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