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# Relative Rate

• 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 ?

• 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 0.20moldmâ€“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