Course:Chem154

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Molar Mass

Molar Mass of a Compound

Determining Chemical Formulas

Chemical Reactions

Chemical Stoichiometry

Summary

Avogadro Constant:

Molar Mass: Found by adding together the molar masses of all of its elements.

Empirical Formula: Contains the smallest set of whole-number subscripts that give relative amounts of constituent atoms.

Molecular Formula: A chemical formula that gives the exact number of different atoms of an element in a molecule.

Law of Conservation of Mass: In every chemical operation an equal quantity of matter exists before and after the operation.

Stoichiometry: Is the use of chemical equations to calculate quantities of substances that take part in chemical reactions.

Stoichiometry Quantities: The exact amounts of reactants and products predicted by the balanced equations.

Limiting Reactant: Is the reactant that runs out first, based on the stoichiometric ratio of all the reactants.

Theoretical Yield: The amount of product predicted by stoichiometry.

Actual Yield: The amount actually obtained.

Percent Yield: The percentage of the theoretical amount that is actually obtained:

Combustion Analysis: A weighted sample of a compound is burned in a stream of oxygen gas; after combustion, all the carbon atoms in the sample are found in the and all the H atoms are in the .


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