Moles and mass

• 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
• What is the relative atomic mass of carbon?

  12 grams
• How much does one mole of oxygen weigh?

  32 grams
• How do you calculate the relative formula mass of CO2?

  12 + 16 + 16 = 44
• What is the formula to calculate the number of moles?

  Number of moles = mass / relative formula mass
• How many moles are in 42.5 grams of ammonia?

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

  132 grams
• How do you find the mass of carbon in 3 moles of CO2?

  Multiply 3 moles by 12 grams
• What is the mass of oxygen in 3 moles of CO2?

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

  As ratios of reactants and products
• If you start with 2 moles of magnesium, how many moles of hydrochloric acid do you need?

  4 moles
• What is produced when 2 moles of magnesium react?

  2 moles of magnesium chloride
• What gas is produced from the reaction of magnesium and hydrochloric acid?

  Hydrogen gas