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# 3.3 (b) relative atomic mass

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### 3.3 (b) relative atomic mass

1. 1. RELATIONSHIP BETWEEN “MOLE” AND “MASS” 1
2. 2. Mole of element / molecule• 1 mole atom of element / molecule have 6.02 x 1023 particles.b) Scientist found that: i) mass of 1 mole atom of any element is Relative Atomic Mass in gram. 2
3. 3. ii) mass of 1 mole atom of any molecule is Relative Molecular Mass or Relative Formula Mass in gram. 3
4. 4. Mass of 1 mole atom of:iv)element = Relative Atomic Mass in gram.ii) molecule = Relative Molecular Mass / Relative Formula Mass in gram. 4
5. 5. For example (element):Relative Atomic Mass of sodium (Na) = 23 g/mol So, the mass of 1 mole atom of sodium (Na) = 23 g 5
6. 6. Try it yourself!! Relative Atomic Mass of magnesium (Mg) = 12 g/molSo, the mass of 1 mole atom of magnesium (Mg) = 12 g 6
7. 7. How about this?The mass of 1 mole atom of argentum (Ag) = 47 g So, the Relative Atomic Mass of argentum (Ag) = 47 g/mol 7
8. 8. For example (molecule):Molecular formula of carbon dioxide = CO2Relative Molecular Mass of CO2= (12 X 1) + (16 X 2) = 44 g/molSo, the mass of 1 mole CO2= 44 g 8
9. 9. Try it yourself!!Relative Molecular Mass of NaCl = 23 + 35.5 = 58.5 g/molSo, the mass of 1 mole of NaCl = 58.5 g 9
10. 10. How about this?Relative Molecular Mass of KCl = 19 + 35.5 = 54.5 g/mol So, the mass of 1 mole of KCl = 54.5 g 10
11. 11. MASS:Mass of Number Relative = X Atomicelement of molein gram of element Mass of the element 11
12. 12. Number of = mass of element in grammoles of Relative Atomic Mass element 12
13. 13. X Relative Atomic MassMole of element Mass of element / Relative Atomic Mass 13
14. 14. MOLE: Relative Molecular Number ÷ Mass of Mass@Relative of mole = molecule Formulaof molecule in gram Mass of the molecule 14
15. 15. X Relative Molecular MassMole of molecule Mass of molecule ÷ Relative Molecular Mass or Relative Formula Mass 15
16. 16. Example 1:What is the mole of 18 g of water? Calculate the molar mass of the water.[Relative Atomic Mass: H=1; O=16] 16
17. 17. Answer:Number of mole of water= mass of H2O in gram relative molecular mass= 18 g 18 g/mol= 1 mole 17
18. 18. Molar mass of water= mass of 1 mole of molecule = 18 g 18
19. 19. ACTIVITIES TIME!! 19
20. 20. That’s all for today!Thank you! 20