Question

At ${100}^{o}C$ the gas reaction $A\to 2B+C$ was observed to be of first order. On starting with pure $A$ it is found that at the end of $10$ minutes the total pressure of system is $176mm$. $Hg$ and after a ling time $270mm$ $Hg$. From these data find (a) initial pressure of $A$ (b) the pressure of $A$ at the end of $10$ minutes (c) the specific rate of reaction and (d) the half life period of the reaction?

Answer 1

Given, $A⟶2B+C$

Assuming whole A has been consumed, so,

Initial pressure$=P_A=\frac{270}{3}=90$ mm

$A⟶2B+Cinitial:9000\text{After 10 min:}90-x2xx$

$⟹(90-x)+\left(2x\right)+\left(x\right)=176⟹x=43\text{mm of Hg}$

So, partial pressure of A after 10 minutes is 47 mm.