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NOVA CHEM 211 CH 3
Calculations with moles, mass percents, mass fractions, percent yields, empirical formulas, molecular formulas, limiting reactants and molarity
13
Chemistry
02/20/2011
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Term
Mass to mole?
 Definition

mass

÷

molar mass
Term
Mole to # of entities?
 Definition

^ 6.02×1023

 
Term
# of entities to mole?
 Definition

# of entities

÷

6.02×1023
Term
Mole to mass?
 Definition
× molar mass
Term
Molecules
 Definition
Covalent compound
Term
Ionic compound
 Definition
Formula units
Term
Mass fraction of X in compound?
 Definition

Molar mass of X

÷ 

molar mass of compound.
Term
Mass percent?
 Definition
Mass fraction ^ 100
Term
Mass in grams of X in XYZg of compound?
 Definition

XYZg

×

mass fraction of X.
Term
# of X atoms in XYZg of compound?
 Definition

Mass → entities

×

# of atoms/ions
Term
% yield?
 Definition

Actual yield divided

÷

theoretical yield

×

100
Term
Molecular formula?
 Definition

Molecular mass

÷

empirical formula mass


Then multiply empirical formula by whole number product.
Term
Molarity?
 Definition

# of moles

÷

# of liters