empirical
the lowest whole number ratio of atoms in a compound
empirical formula
this is the actual formula for a molecular compound
molecular formula
this is one of the most common calculations in chemistry
what is percent composition
this is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
a mole
the process by which one or more substances are changed into one more different substances
chemical reaction
this is the empirical formula
what is CH
this is the molecular formula
C6H6
table salt is always this percentage
39.3
this is Avogadro's number
6.022x10^23
what is represented by a chemical reaction
chemical reaction
what are ALWAYS empirical
ionic compounds
the molecular formula is a whole number multiple of what
the empirical formula
compounds mass has the same percentage composition by mass as styrene, c8h8
benzene C6H6
what is the mass of grams in one mole of carbon
12.01
what are reactants
substances that combine and substances to the left
this may also be its empirical compounds
some molecular compounds
this is the molecular formula for acetylene
what is C2H2
this is the percentage composition of K in KMnO4
25
what is mass in gram per mole
molar mass
what is a product
substances formed and substances to the right
what are the three steps for calculating empirical formulas
1. determine
2. divide
3. multiply
what the molecular formula for benzene
C6H6
calculate the percent composition of carbon in C6H12O6
40
what represents one formula unit of salt
NaCl
the change of state or phase is a
physical change