Stoichiometry is the area of chemistry that concerns the amounts of materials involved in compounds and chemical reactions. The key concepts are:
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1
Atoms of different elements have different numbers of protons, neutrons, and electrons.
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2
The average atomic weight of the collection of isotopes of each element is listed on the periodic table.
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3
Atoms are too small to weigh, so we use the concept of the mole, which is a collection of 6.022 × 10²³ atoms.
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4
The mass of 1 mol of an element is equal to its atomic weight from the periodic table, measured in grams.
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5
It is imperative to be able to convert between grams and moles of an element.
Molar Masses of Common Elements
Use this table as a reference. Practice until you no longer need it.
| Element | Sym | Molar Mass (g/mol) |
|---|
| Element | Sym | Molar Mass (g/mol) |
|---|