Stoichdards

Stoichiometry Standards

Molar Mass: Mass in grams of 1 mole of a substance.

--Molar Mass Units = g/mol
Molar Mass of the compound H2O
                                              |              |
                      -- atomic mass --|


                      2(1) + 16 = 18 g/mol
Mole: a mole of any element is defined as the number of atoms of that element
equal to the number of atoms exactly 12.0 grams of carbon-12

--# of atoms in one mole is always the same=6.02 x 10^23 (Avogadro's Number)

Key Terms

H
Hydrogen

1       1.0794

O
Oxygen

8     15.9994

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Stoichiometry Standards

Moles to Grams.
# of moles X molar mass = mass in grams

Ex. 1 mol X 23 g/mol = 23 grams

Grams to Moles
mass in grams / molar mass = # of moles

Ex. 23 grams / 23 g/mol = 1 mol

Stoichdards

Calculations