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Quantative Chemistry (Mole (In chemical reaction mass is always conserved,…

- - - - in unsealed reaction vessels
      - goes up
        
        reactant gas in air and products solid, liquid or aqueous
        
        E.g metal reacting with oxygen in unsealed container
      - goes down
        
        product is gas and reactants solid, liquid or aqueous
        
        produced gas can escape
        
        E.g metal carbonate decomposes to metal oxide & CO2
      - particle theory gas will expand and fill any container so if not sealed will escape into the air
- - - - usually added to make sure limiting reactant is used up