PCAT Compounds and Stoichiometry
Terms
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[GEM]
Gram Equivalent Weight -
GEM = Molar Mass / n
n = # of hydrogens or hydroxl groups per molecule - Percent Composition
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% Comp =
Mass of X in Formula / Formula Weight of Compound
x 100% - Percent Yield
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Percent Yield =
actual yield / theoretical yield
x 100% - Mole
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Mole =
weight of sample (g) / Molar Weight (g/mol) - Avogadro's Number
- 6.022E23
- Molecular Weight
- sum of the atomic weights (in amu) of atoms in a molecule
- Empirical Formula
- gives the SIMPLEST whole number ratio of elements in a compound
- Molecular Formula
- gives the EXACT number of atoms of each element in the compound
- Combination Reaction
- reaction in which two or more reactants form one product
- Decomposition Reaction
- reaction in which a compound breaks down into two or more substances
- Single Displacement Reaction
- reaction that occurs when an atom of one compound is replaced by an atom of another element
- Double Displacement Reaction
- reaction in which elements from two different compounds displace each other to form two new compounds
- compound
- pure substance that is composed of two or more elements in a fixed proportion
- molecule
- combination of two or more atoms held together by covalent bonds
- Equivalents
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equivalents =
weight of compound / gram equivalent weight