Relative Rate

• hoay

  30 Dec 15, 03:25

  For  a reaction whose rate= k [CH3CHO][CH3OH][H+]

   exp      [CH3CHO]      [CH3OH]     [H+]       relative rate

    1          0.20            0.10       0.05          1.00

    2          0.25            0.10       0.05          1.25

    3          0.25            0.16       0.05          2.00

  Calculate the relative rate of reaction for a mixture in which the starting concentrations of all three reactants are 0.20moldm–3 .

  Do we hve to use the rate expression for this ? 

• UltimaOnline

  30 Dec 15, 04:03

  Originally posted by hoay:

  For  a reaction whose rate= k [CH3CHO][CH3OH][H+]

   exp      [CH3CHO]      [CH3OH]     [H+]       relative rate

    1          0.20            0.10       0.05          1.00

    2          0.25            0.10       0.05          1.25

    3          0.25            0.16       0.05          2.00

  Calculate the relative rate of reaction for a mixture in which the starting concentrations of all three reactants are 0.20moldm–3 .

  Do we hve to use the rate expression for this ? 

  
  Since all 3 reactants are 1st order (as per the rate eqn), hence based on exp 1, the new rate of reaction will be : 1.00 x (0.20/0.20)^1 x (0.20/0.10)^1 x (0.20/0.05)^1 = 8.00