SNC2DY-a Moles and Stoichiometry Formulas

n=

# of mol

M=

molar mass (g/mol)

m=

mass of sample (g)

N=

# of entities

NA

6.02x10^23 entities/mol

formula for n=

m/M

another formula for n=

N/NA

m/M=

N/NA

in stoich, what is the 1st step?

always write balanced chemical equation

grams---> grams

gA--> mol A (molar mass)--> mol B (mol ratio)--> gB (g of B/mol of B)

moles to moles

mol A--> mol B (mole ratio)

molecules to atoms

molecules x # of atoms of ?/molecules

moles to grams

mol A--> mol B (mol ratio)---> gB(molar mass)

grams to moles

gA--> mol A (molar mass)---> mol B (mol ratio)

moles to total mass of products

mol A--> mol products/molA--->gproducts/molproducts

atoms to moles

1 mol/6.022 x 10^23 atoms

moles to atoms

6.022 x 10^23 atoms/1 mol