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Flashcards in Stoichiometry Deck (14):
1

Compound

a pure substance composed of two or more elements in a fixed proportion

2

Molecule

a combination of two or more atoms held together by covalent bonds and is the smallest unit of a compound that still displays the properties of that compound

3

Molecular weight

the sum of the atomic masses of the atoms in the molecule

4

Mole

the amount of a substance that contains the same number of particles found in a 12 g sample of carbon

mole = weight of sample (g) / molar weight (g/mol)

5

Gram-equivalent weight (GEW)

equivalents = weight of compound/gram equivalent weight

gram equivalent weight = molar mass/n

6

Law of constant composition

states that all samples of a given compound will contain the same elements in identical mass ratios

7

Empirical Formula

gives the simplest whole number ratio of the elements in a compound.

8

Molecular Formula

gives the exact number of each element in the compound and is a multiple of the empirical formula

9

Percent Composition

mass of x in formula / formula weight of compound x 100%

10

Law of Conversation of Mass

the mass of the reactants in a reaction must be equal to the mass of the products

11

Stoichiometric coefficients

used to indicate the number of moles of a given species involved in the reaction

12

Theoretical Yield

the amount of product that can be predicted from a balanced equation, assuming tha tall of the limiting reagent has been used, no competing side reactions have occurred, and all of the product has been collected.

13

Actual Yield

the amount of product isolated from the reaction experimentally

14

Percent Yield

used to express the relationship between the actual yield and the theoretical yield and is given by the following equation:

% yield = actual yield/theoretical yield x 100%