If pressure is given in gaseous reactions then we use the following kinetic equation.
where p0 is the pressure at the initial stage p0-x is the pressure at time ‘t’ values of p0 and x can be calculated using the following examples.
Case I: If total pressure of the reaction mixture is given in place of pressure of reactants.
pt = (p0 – x + x + x + x)
Where pt is the pressure of reaction vessel at time ‘t’.
Case II: If the pressure of the reaction vessel after a long time or infinite time is given
pt = p0 + p0 +p0
