Welcome to quantitative chemistry. In class thus far we have discussed how and why reactions occur and how to qualitatively describe reactions. In real chemistry however, you not only need to know what the reactants are but also how much of each to mix together. This is done using the idea of the mole. Since atoms are ridiculously small we can not say: mix 8 atoms of x with 5 atoms of y. Hence chemists devised an ingenious way to count atoms via their weight. It can seem complicated at first but ultimately it is just a definition which hopefully you will understand, if you do not understand it you will need to just flat out memorize it because ultimately the idea can be broken down to a definition. The reading explains the important topics of: the mole (abbreviated mol, I know, not really worth it), Avogadro's number, molar mass, and gram to mole conversions.
TIME TO REMEMBER UNIT CONVERSIONS!!!!!!!!!!!!
- read pages 80 (relating mass to number of atoms) -85
- Make sure you carefully read and understand sample problems 3-4, and 3-5
- do the practice problems on page 85
- complete problems 5, 6, and 7 on page 85
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