mole

• What does the term mole refer to in chemistry?

  A unit to measure the amount of substance
• How many particles are in one mole of a substance?

  $6.02 \times 10^{23}$ particles
• What does Avogadro's constant represent?

  The number of particles in one mole
• If you have one mole of carbon, how many atoms are present?

  $6.02 \times 10^{23}$ atoms of carbon
• What is the mass of one mole of carbon?

  12 grams
• What is the relative formula mass of one mole of oxygen?

  32 grams
• How do you calculate the number of moles in a sample?

  Mass divided by relative formula mass
• How many moles are in 42.5 grams of ammonia?

  1. 5 moles
• What is the relative formula mass of ammonia?

  17
• What is the mass of 3 moles of carbon dioxide?

  132 grams
• How do you find the mass of carbon in three moles of carbon dioxide?

  Multiply moles by carbon's mass
• What is the mass of carbon in three moles of carbon dioxide?

  36 grams
• How can you find the mass of oxygen in carbon dioxide?

  Subtract carbon's mass from total mass
• How can chemical equations be interpreted in terms of moles?

  As ratios of reactants and products
• How many moles of hydrochloric acid are needed for 2 moles of magnesium?

  4 moles
• What is produced when magnesium reacts with hydrochloric acid?

  Magnesium chloride and hydrogen gas
• What is the relationship between moles, mass, and relative formula mass?

  • Number of moles = mass / relative formula mass
  • Mass = number of moles × relative formula mass
  • Relative formula mass = mass / number of moles
• What are the components of a chemical equation in terms of moles?

  • Reactants and products are in mole ratios
  • Example: 1 mole of magnesium reacts with 2 moles of hydrochloric acid
  • Produces 1 mole of magnesium chloride and 1 mole of hydrogen gas