$4.$ Total pressures have been observed at various times during a gas reaction in a closed vessel. Differential analysis was then performed with the data obtained and the following values $$were calculated for the partial pressure of component A and the reaction rate.Total pressures have been observed at various times during a gas reaction

in a closed vessel. Differential analysis was then performed with the data

obtained and the following values were calculated for the partial pressure of

component A and the reaction rate.

a$)15P$

Considering that the rate expression is $-rA=K{P}^{\text{'}\text{'}},$

calculate the order $(n)$ and rate constant $(k)$ of this reaction using the linear

regression method.

b$)15P$

Calculate the pressure or reaction rate for $t=1\mathrm{.}5,t=4\mathrm{.}8$ and $t=8\mathrm{.}6$