Stoichiometry Diagram | Quizlet

TERM

Coefficient

DEFINITION

A number in front of a chemical formula in an equation that indicates how many molecules, atoms or moles of each reactant and product are involved in a reaction.

stoichiometry

The calculation of quantities in chemical reactions

mole ratio

a conversion factor derived from the coefficients of a balanced chemical equation used for mole to mole calculations

percent yield

actual yield/theoretical yield x 100

theoretical yield

the maximum amount of product that can be produced from a given amount of reactant - the calculated yield

actual yield

the amount of product that forms when a reaction is carried out in the laboratory

excess reagent

the reactant that is not completely used up in a reaction

limiting reagent

any reactant that is used up first in a chemical reaction; it determines the maximum amount of product that can be formed in the reaction

molar mass

the mass of one mole of an element or compound

mole to mass conversion

#A --> #B

molar ratio #B/#A --> molar mass B

mass to mole conversion

#A --> #B

molar mass A --> molar ratio #B/#A

Mass to Mass Conversions

#A --> #B

molar mass A --> molar ratio #B/#A --> molar mass B

method for calculating molar mass

ALMA

ALMA

A = atom inventory

L = look up molar mass

M = multiply by subscript

A = add together

units are in g/mol

TERM

subscript

DEFINITION

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

Avagadro's number

6.02x10^23, the number of atoms or molecules in 1 mol

What is the mole in chemistry?

The SI unit for counting the number of atoms or molecules in a reaction.

What does the mole tell you in a chemical reaction?

How many 'pieces' of something are involved in a chemical reaction.

coefficients in a balanced chemical equation

specify the relative amounts (ratio) in moles of each of the substances involved in the reaction

average atomic mass

the molar mass of elements; used to calculate the molar mass of compounds