Moles

• What is the formula for finding the number of moles?

  Number of Moles = Mass in g / Mᵣ
• What does one mole of atoms or molecules represent in grams?

  It equals the relative particle mass of the substance
• If the relative particle mass (Mᵣ) of a substance is 18 g/mol, how many moles are in 36 g of that substance?

  2 moles
• How does the mass of one mole of a substance relate to its relative particle mass?

  It is equal to the relative particle mass in grams