Chemistry Mole-Mass-Particles: Key Formulas and Practice Examples

What is a mole in chemistry?

A counting unit equal to 6.022 × 10^23 particles (atoms, molecules, ions, etc.)

What is Avogadro's number?

6.022 × 10^23 — the number of particles in one mole.

How do you convert grams to moles?

mol = grams / molar mass

How do you convert moles to particles?

particles = mol × 6.022 × 10^23

How do you convert moles to volume in a solution?

volume (L) = mol / molarity

How do you find mass from volume and density?

mass = volume × density

How do you convert molecules to grams?

Step 1: mol = molecules / 6.022 × 10^23; Step 2: grams = mol × molar mass

How many moles are in 75.0 g of NaCl?

Grams → Moles

How many molecules are in 3.25 mol of CO₂?

Moles → Particles

How many grams of H₂O are in 2.00 mol?

Moles → Grams

How many moles are in 1.50 × 10²⁴ molecules of O₂?

Particles → Moles

A sample contains 250.0 mL of methanol with a density of 0.792 g/mL. How many grams?

Volume → Grams

How many liters of 1.50 M HCl are needed to get 4.00 mol?

Moles → Volume (solution)

How many moles are in 0.750 L of 2.00 M NaOH?

Volume → Moles (solution)

Convert 5.00 g of CH₄ to moles.

Grams → Moles

How many atoms are in 0.250 mol of Mg?

Moles → Particles

How many grams of NH₃ are in 1.80 × 10²⁴ molecules?

Particles → Moles → Grams

How many moles are in 100.0 g of glucose (C₆H₁₂O₆)?

Grams → Moles

How many molecules are in 18.0 g of H₂O?

Grams → Moles → Particles

How many grams of ethanol are in 200.0 mL if density is 0.789 g/mL?

Volume → Grams

How many moles are in 3.00 L of 0.500 M H₂SO₄?

Volume → Moles (solution)

How many liters of 0.250 M NaCl are needed to get 1.25 mol?

Moles → Volume (solution)