Equations

• To work out the relative formula mass of an element, you need to find out what the relative atomic mass is of the element. Example: Hydrogen has a relative atomic mass of 1.
• A mole is 6.02 x 10^23
• Moles= mass (g) / Mr of element
• Yield is the mass of product that a chemical reaction produces.
• Percentage yield= (actual mass of product / theoretical mass of product) x 100%
• Mr is an abbreviation of the relative formula mass. For relative atomic mass, it is Ar.
• Relative atomic mass is the ratio of the average mass of atoms of an element to 1/12 of the mass of an atom of carbon-12.
• The mole describes a number of atoms or molecules. One mole of a substance is its relative formula mass or relative atomic mass in grams.
• Concentration(g/dm3)= mass of solute/ volume of solution(dm3)
• 1dm3 x 1000= 1000cm3
• concentration (mol/dm3)= moles/volume (dm3)
• Dm= decimeter
• concentration (g/dm3)= concentration (mol/dm3) x Mr
• Moles= concentration (g/dm3 or mol/dm3) x volume (dm3)
• Atom economy= total Mr of desired product / total Mr of reactants x 100
• Volume= moles x 24