Paper 1 Equations

• Relative formula mass equation


  Relative atomic mass of all atoms in the compound added together
• Concentration equation $g/dm^3$


  Concentration = Mass (g)/ Volume (dm^3)
• Mean rate of reaction (g/s or $cm^3/s$)


  Quantity of reactant used OR quantity of product formed/time taken
• Chromatography Rf value


  Distance moved by substance/Distance moved by solvent
• Moles equation


  Moles = mass (g)/relative formula mass
• Avogadro's number


  There are 6.02 x 10²³ particles of a substance in 1 mole.
• Number of particles in a substance

  Moles × Avogadro's number
• Relative atomic mass (Ar)


  For an element, the relative atomic mass is the same as its mass number on the periodic table.
• Percentage mass of an element in a compound

  (Ar × number of atoms in that element / Mr of the compound) × 100
• Yield equation


  % Yield = (Mass of product / theoretical mass) × 100
• Equation for atom economy

  Atom Economy = (Mr of desired product/Mr of all reactants) × 100