Conversion Worksheet
Use the following to help you convert between units:
Mole to Grams—one step process:
1. First find the molar mass of the substance (get the atomic masses and add up)
Ex: H2O contains H= 1.01(2) = 2.02 + O = 16.00 total mass = 18.02g in 1 mole
2. Now convert mole of the substance to grams of the substance by using the molar mass as the
conversion factor: EX: 18.02g
1 mole
Grams to Mole—one step process:
1. First find the molar mass of the substance (get the atomic masses and add up)
Ex: H2O contains H= 1.01(2) = 2.02 + O = 16.00 total mass = 18.02g in 1 mole
2. Now convert grams of substance to mole of the substance by using the molar mass as the
conversion factor: EX: 1 mole
18.02g
Mole to Representative Particles—one step process:
1. Convert moles of substance into representative particles such as (molecules, atoms, or formula
units) by using the following conversion factor: 6.02 x1023 representative particles
1 mole
Representative Particles to Moles—one step process:
1. Convert moles of substance into representative particles such as (molecules, atoms, or formula
units) by using the following conversion factor:
1 mole________________
6.02 x 1023 representative particles
Grams to Representative Particles—one step process:
1. First find the molar mass of the substance (get the atomic masses and add up)
Ex: H2O contains H= 1.01(2) = 2.02 + O = 16.00 total mass = 18.02g in 1 mole
2. Convert grams of substance to representative particles such as (molecules, atoms, or formula
units) by using the following conversion factor: Use the molar mass of the substance given and
Avogadro’s number.
6.02 x 1023 representative particles
18.02 g H2O
Representative Particle to Gram—one step process:
1. First find the molar mass of the substance (get the atomic masses and add up)
Ex: H2O contains H= 1.01(2) = 2.02 + O = 16.00 total mass = 18.02g in 1 mole
2. Convert grams of substance to representative particles such as (molecules, atoms, or formula
units) by using the following conversion factor: Use the molar mass of the substance given and
Avogadro’s number.
18.02g____________
6.02 x 10 representative particles
23
Volume of a gas at STP, use the following conversion factors:
Mole to Volume—one step process:
1. Convert the moles given of the gas at STP by using the molar volume of the gas as the
conversion factor this way: 22.4 L
1 mole
Volume to Mole—one step process:
1. Convert the moles given of the gas at STP by using the molar volume of the gas as the
conversion factor this way: 1 mole
22.4 L
Volume to grams—two-step process:
1. First find the molar mass of the substance given, for example water: H2O
contains H= 1.01(2) = 2.02 + O = 16.00 total mass = 18.02g in 1 mole
2. Also know that the molar volume of a gas at STP is always 22.4 L in 1 mole
3. Now convert using the following conversions: first convert volume to moles—
1 mole
22.4 L
then convert those moles to mass using the following conversion: 18.02g
1 mole
Set-up:
50.5 L of H2O x 1 mole x 18.02g = 40.6 g
22.4 L
1 mole
****Grams to Volume would be in the reverse order from the above—first convert grams
to moles, then convert the moles to volume. See next page----
50.5 g H2O x 1 mole x 22.4 L = 62.8 L
18.02g
1 mole
Volume to Representative Particles—two-step process:
1. Must convert the volume given to representative particles such as (molecules, atoms, or
formula units by using Avogadro’s number).
2. Convert volume to moles by using:
By using
1 mole then convert moles to representative particles
22.4 L
6.02 x1023 representative particles
1 mole
EX: 25 L H2 x 1 mole x
22.4 L
6.02 x1023 representative particles = 6.72 x 1023 Atoms
1 mole
Representative Particles to Volume, you would do the reverse process of the above:
Example--
3.0 x 1023 atoms x 1 mole
x
23
6.02x10 atom
22.4 L = 11.2 L
1 mole