Calculations in chemistry

• The mole

  • The mass of one mole of a substance is equal to its:
  • Relative atomic mass-for an element
  • Relative formula mass-for a compound
  • The number of particles in one mole is $6.02\ X\ 10^{23}$
• Mols= $\frac{mass\ }{mr}$
• Concentration

  • The higher the concentration the more particles of the substance are present
• Balanced equations

  • And molar values are used to calculate the masses of reactants and products
• Limiting reactant

  • The reacting substance that is completely used up in a chemical reaction and which determines how much product is made
• Reactions in solution

  • amount of solute in mol= $\frac{concentration\ in\ mol}{dm^{3\ }X\ volume\ in\ dm^3}$
• Units of volume

  • Divide 1000 to convert cm3 to dm3
• Concentration= $mass\div volume$