5
Solution
Solution
Solution
Solution
Solution
Let us consider a typical first order gas phase reaction
A(g) ® B(g) + C(g)
Let pi be the initial pressure of A and pt the total pressure at
time ‘t’ Integrated rate equation for such a reaction can be derived  as
Total pressure pt = pA + pB + pC (pressure units)
Rationalised 2023-24
75
Chemical Kinetics
pA, pB and pC are the partial pressures of A, B and C, respectively If x atm be the decrease in pressure of A at time t and one mole each
of B and C is being formed, the increase in pressure of B and C will also
be x atm each A(g)      ®      B(g)       +         C(g)
At  t = 0
pi atm
0 atm
0 atm
At time t
(pi–x) atm
x atm
x atm
where, pi is the initial pressure at time t = 0