Particle/Mole Conversions

Mole Conversions

#1 Particles and Moles

Mole Conversions

There are three simple mole conversions you must master as a
chemist:

1.

Converting between particles (atoms, molecules or formula
units) and moles.

2.

Converting between mass (g) and moles.

3.

Converting between volume (L) and moles at
standard temperature and pressure (STP).

Particles & Moles

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1 mole = 6.02 x 1023 particles = Avogadro’s Number

●

Particles: atoms, ions, molecules, formula units

●

To convert from…

○

moles to particles, multiply by Avogadro’s number

○

particles to moles, divide by Avogadro’s number

Multiple Choice

What is a particle?

• atoms

• ions

• molecules

• all of the above

Multiple Choice

What is a mole?

• 1 mole = 6.02 x 10²³ particles

• Avogadro's number

• a number I need to memorize for the test

• all of the above

Example: How many atoms are in 0.25 moles of iron?

Moles to Atoms

Multiply moles of Fe by Avogadro's number.

Example: How many moles are in 1.7 x 1024 molecules of
carbon dioxide, CO2?

Molecules to Moles

Divide molecules of CO2 by Avogadro's number.

Multiple Choice

How many molecules of glucose (C₆H₁₂O₆) are in a mol?

• 180.18 molecules

• 24 molecules

• 180.18 g/mol

• 6.02x10²³ molecules

Multiple Choice

How many moles are in 16.94g of water?

• 16.94 mol H₂O
• 0.9401 mol H₂O
• 305.3 mol H₂O
• 1.063 mol H₂O

Multiple Choice

How many molecules are in 9.44 moles of AlCl₃?

• 5.68 molec AlCl₃
• 5.68x10²⁴ molec AlCl₃
• 0.705 molec AlCl₃
• 1.25x10²³ molec AlCl₃

Multiple Choice

How many grams are in 3.3 mol of Potassium Sulfide?

• 360 g
• 454 g
• 238 g
• 132 g

Multiple Choice

How many molecules of sugar (C₆H₁₂O₆) are in a mole?

• 24 molecules
• 180 molecules
• 180 g
• 6.02 x 10²³ molecules