Stoichiometry general (st-70) How does stoichiometry work? On what must one itself in particular: eight, at a stoichiometry accounts? How functioning the word problems at the stoichiometry [translation unavailable] [translation unavailable]? Is there an application pattern? (calculate the number of molecules, how many grams are made, how many grams are needed, etc.)

  Exercise: st-70    

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How does stoichiometry work? On what must one itself in particular: eight, at a stoichiometry accounts? How functioning the word problems at the stoichiometry [translation unavailable] [translation unavailable]? Is there an application pattern? (calculate the number of molecules, how many grams are made, how many grams are needed, etc.)

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Solution:

To clarify the questions, the concepts must be known as molar mass and number mol. The question and its answer can be summarized as follows:

1. The most important finding in stoichiometry is that the number of atoms/molecules involved is central.
2. The number of atoms involved must be identical on both sides of the reaction arrow, no atoms are lost or added.
3. Start with the molecules given by mass m and calculate the number of molecules n.
4. Reason the (balanced) stoichiometric equation can well, you know, first of all on the number Mol 'n' closed are.
5. Based on the number of mole 'n' and the ever-calculable molar masses 'M', the masses m of the unknown substances can now be calculated: from n=m/M follows m=n·M

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