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Atoms & Molecules (Mole Concept (quantity in'no' (having a…

- - - - "valence
        
        gives atom
        
        to form comp
  - - - representation
        
        of composition
    - - valency-balance
        
        Cl
        
        H
        
        1
        
        1
      - symbol of base radical first
        
        CaO
      - polyatomic
        
        ions in ()
        
        ion = 1,no()
        
        NaOH
- - - - of all atoms
        
        of substance mo
    - - H+N+O*3
        
        =1+14+(16*3)
        
        =63 u
        
        u=atomic mass unit
  - - - of all atoms
        
        of compound formula
    - - 123+135.5
        
        =58.5 u
- - - - equal to its atomic
        
        or molecular mass
        
        in grams
  - - - 1 mole of substance
        
        is fixed
        
        6.022*10
        
        called avagadro number
  - - - characterised by
        
        no of molecules
        
        or "mass"
  - - - ex:weight of 1 mole H2O=18g water