The Mole

• What is the term used to measure the amount of chemical substance?

  Mole
• How is the mole similar to other units of measurement like meters and seconds?

  It measures the amount of substance.
• How many particles are in one mole of a substance?

  1. 02 times 10 to the 23
• What does the term "particles" refer to in the context of moles?

  Atoms, molecules, ions, or electrons.
• If you have one mole of carbon, how many atoms of carbon do you have?

  1. 02 times 10 to the 23 atoms of carbon.
• What is Avogadro's constant?

  It is the number of particles in one mole, which is 6.02 times 10 to the 23.
• Why does one mole of a substance weigh the same number of grams as its relative atomic or formula mass?

  Because the mass of that many particles equals the relative atomic or formula mass in grams.
• What is the weight of one mole of carbon, given its relative atomic mass is 12?

  12 grams.
• How much does one mole of oxygen weigh if its relative formula mass is 32?

  32 grams.
• What is the weight of one mole of carbon dioxide (CO2) with a relative formula mass of 44?

  44 grams.
• What formula can be used to calculate the number of moles in a sample?

  Number of moles = mass / relative formula mass (mr).
• How many moles are in 42.5 grams of ammonia (NH3) if its mr is 17?

  1. 5 moles.
• How do you calculate the mass of carbon in three moles of carbon dioxide?

  Multiply the number of moles by the mass of carbon (3 moles * 12 grams = 36 grams).
• What is the mass of 3 moles of carbon dioxide (CO2)?

  132 grams.
• What is the mass of oxygen in three moles of carbon dioxide if the total mass is 132 grams and the mass of carbon is 36 grams?

  96 grams.
• How can chemical equations be interpreted in terms of moles?

  • Chemical equations represent the ratios of moles.
  • Example: 1 mole of magnesium reacts with 2 moles of hydrochloric acid.
  • Produces 1 mole of magnesium chloride and 1 mole of hydrogen gas.
• If you start with 2 moles of magnesium, how many moles of hydrochloric acid do you need to react with it?

  4 moles of hydrochloric acid.
• How many moles of magnesium chloride are produced from 2 moles of magnesium?

  2 moles of magnesium chloride.
• How many moles of hydrogen gas are produced from 2 moles of magnesium?

  2 moles of hydrogen gas.