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Raoult's Law -

• Raoult's Law states that the vapour pressure above a liquid is dependant on the mole fraction of the liquid components involved and their individual vapour pressures.
  
  i.e. P_tot = P_AX_A + P_BX_B
  
  where P_A and P_B are the vapour pressures of the A and B components and
  
  X_A and X_B are the mole fractions.
  
  That is the vapour pressure of water/ethanol solution will ideally lie somewhere in between their individual vapour pressures.