Moles/Empirical Formula

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how to find # of particles (quantity)

# of given moles x 6.02x10^23 particles/mol

how to find mass

# of moles x molar mass g/mol

volume

1 mole=22.4 liters

mass

6.02x10^23 particles of given substance

25 grams of HF = how many moles

1.25

67.2 L = how many moles

3

A compound with an empirical formula of C2OH4 and molar mass of 132 grams per mole. Determine the molecular formula

C6O3H12

Empirical Formula of hydrocarbon is C3H4. the molecular weight was calculated to be 121 amu. What is its molecular formula?

C: 3(12.011)=36.00 amu H: 4(1.008)=4 amu C3H4 empirical formula weight: 40 amu 121 amu/40 amu = 3 C: 3*3=9 H: 4*3=12 Molecular Formula: C9H12

Empirical Formula of C5H10O5

CH2O

Whole Number Multiple (helps you figure out the molecular formula)

Molecular Weight/Empirical Formula Weight Then you multiply the answer to each of the parts of the empirical formula

molecule

compound with covalent bonds nonmetal/metal 2+ capital letters

formula units

compounds with ionic bonds metal bonded with nonmetal

how to find volume

given # of moles x 22.4 l/mol

how to find moles (quantity)

given # of particles/6.02x10^23 particles/mol

how to find moles

given mass/molar mass g/mol

how to find moles (volume)

given volume/22.4 l/mol

Avogadro's #

one mole of anything= 6.02x10^23

atoms

pure elements only 1 capital letter

molar mass

atomic mass found on periodic table

particles

atoms, molecules, formula units

How many atoms are there in 3.2 moles of iron

1.9 x 10^24

How many molecules are there in 3.2 moles of sulfur dioxide, SO2?

1.9 x 10^24

5 moles = how many liters

112

88.4 moles of NI3 = how many grams

34,891.48

6.6 moles of ZnO = how many grams

534.6

Percent of Carbon in C2H6

80%

65.5% C, 5.5% H, and 29%O - determine the empirical formula

C3H3O

A compound has a molecular formula of C8H8O2, what is it's empirical formula

C4H4O

mole

unit used with very small particles 6.02x10^23 mass, volume, quantity can be determined

formula mass

when finding mass of compound


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