Amount of substance

• what is amount of substance ?

  • Amount of substance is the name given when counting the number of particles in a substance
  • Amount of substance is often seen in calculations using the letter / symbol n
  • The units for amount of substance are moles / mol
• what is Avogadro's constant ?

  Avogadro constant, NA, is the number of particles equivalent to the relative atomic, molecular or formula mass of a substance

  • The Avogadro constant applies to atoms, molecules, ions and electrons
  • The value of NA is 6.02 x 1023 g mol-1
• what is the molar mass ?

  • This is the mass of substance that contains the same number of fundamental units as exactly 12.00 g of carbon-12
• how are mass, mols and molar mass linked ?

  n = mass, m / molar mass, M
• what is the molar gas volume ? What is it equal to ?

  • The molar gas volume is the volume occupied by one mole of any gas, at room temperature and pressure
  • The molar volume is equal to 24 dm3 
• one mole of any element is equal to what ?

  the relative atomic mass of the element in grams