Question

A reaction proceeds by the following single-step mechanism: A → 2B + Cand the Arrhenius expression for the rate coefficient is k = (2.58x107 s−1) exp [−(34.25 kJ mol−1)/RT]

If the initial pressure of A is 0.100 bar in a fixed volume of 4.00 L, quantitatively plot the partial pressures of A, B, and C as a function of time at

(a) 300.0 K

(b) 400.0 K

Choose the time axis range (seconds) so that about 99% of A has decomposed.

Answer 1

(a) At 300.0 K

Let P0 and O be the initial partial pressure and equilibrium partial pressure of A.

When time t is 0.0001 s

Let PB and PC be the partial pressures of B and C respectively.

(b) At 400.0 K

Let P0 and O be the initial partial pressure and equilibrium partial pressure of A.

When time t is 0.0001 s

Let PB and PC be the partial pressures of B and C respectively.