Saturday, 30 March 2013

1.18 understand the term mole as the Avogadro number of particles (atoms, molecules, formulae, ions or electrons) in a substance

A mole is Avogadro's number simpy because if you have 1 mole of an element its weight in grams will be its atomic mass.

6 comments:

  1. Thanks Hanna
    You're a great help

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  2. What about for molecules and formulae thanks

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    Replies
    1. Formulae for example water. 1 mol of it would be , 1+1+16 = 18. 18g of water is 1 mol. Hydrogen is 1 but you times it by two, then add that to the 16 of oxygen which gives you 18.

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  3. The Chemistry Syllabus has changed…

    Here is a New blog for the 2017 Syllabus:

    https://igcse-chemistry-2017.blogspot.hk/

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