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Determining Rate Equations

Determining Rate Equations. x 3. x 3. Rate is proportional to change [Z] Rate 1 st order w.r.t. Z Rate = k [Z] so far. / 2. Concentration of X halved Rate unchanged Rate zero order w.r.t. X Rate = k [Z] so far (X term omitted). x 4. x 16. Concentration of Y x 4

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Determining Rate Equations

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  1. Determining Rate Equations

  2. x 3 x 3 • Rate is proportional to change [Z] • Rate 1st order w.r.t. Z • Rate = k [Z] so far

  3. / 2 • Concentration of X halved • Rate unchanged • Rate zero order w.r.t. X • Rate = k [Z] so far (X term omitted)

  4. x 4 x 16 • Concentration of Y x 4 • Rate x 16 (42) • Rate 2nd order w.r.t. Y • Rate = k [Z] [Y]2

  5. Deduce order w.r.t. A & B. Write rate equation & then calculate ? • [B] x2 and Rate x2 • Reaction is 1st order w.r.t. [B] • Rate = k [B]

  6. Deduce order w.r.t. A & B. Write rate equation & then calculate ? • [A] x2 and Rate x4 (22) • Reaction is 2nd order w.r.t. [A] • Rate = k [B] [A]2

  7. Deduce order w.r.t. A & B. Write rate equation & then calculate ?

  8. [A] x2 and [B] x2 • Rate x8 (23) • This means overall order is 3 • Rate = k [B] [A]2

  9. Rate = k [A]2 [B] x2.52 x 2.5 x6.5 1.0 x 10-3

  10. Rate = k [X]2 [Y] ./. 4 ./. 4 0.1

  11. Rate = k [X]2 [Y] x 1.52 x 3 x3 x1.5 x 6.75 0.1 8.1 x 10-4

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