Moles

• What unit is used to measure chemical amounts?

  Moles
• What is the symbol for the mole?

  mol
• What does one mole of a substance contain?

  The same number of stated particles
• What types of particles can one mole contain?

  Atoms, molecules, or ions
• What is the value of the Avogadro Constant?

  $6.02 \times 10^{23}$ particles
• How many atoms are in one mole of sodium (Na)?

  $6.02 \times 10^{23}$ atoms
• How many molecules are in one mole of hydrogen (H2)?

  $6.02 \times 10^{23}$ molecules
• How many formula units are in one mole of sodium chloride (NaCl)?

  $6.02 \times 10^{23}$ formula units
• What is the mass of 1 mole of a substance called?

  Molar mass
• How is the molar mass of an element defined?

  It is the same as the relative atomic mass in grams
• How is the molar mass of a compound defined?

  It is the same as the relative molecular or formula mass in grams
• What is the formula to calculate the number of moles of a substance?

  Number of moles = Mass / Molar mass
• If a substance has a mass of 10 grams and a molar mass of 5 grams/mol, how many moles are present?

  2 moles
• moles unit symbol is mol
• mole, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.