9. If 75 percentage of a first order reaction was completed in 60 minutes. 50 percentage of the same
reaction under the same conditions would be completed in
Answers
Answer:
29.98 so aprox 30 min
Explanation:
Hint: Let us first understand what is meant by order of a reaction. The order of a reaction is a number that relates the rate of a reaction with the concentration of the reactants or products.
Complete solution:
A reaction in which the rate of the chemical reaction is directly proportional to the concentration of one of the reactants is called First order chemical reaction. Half life of a reaction is defined as the time taken by the reactant to reduce to one-half of its initial concentration
For a first order reaction we can use
k1=(2.303t)log(aa−x) to find the value of k1
Where k1 is the reaction rate constant.
Substituting the values in the above equation we get
k1=(2.30360)log(11−0.75)k1=0.0231
To calculate half-life, we can use t12= 0.693k=0.6930.0231=29.98min
Upon substitution of values in above equation we get,
Half-life, t12=29.98min
Therefore,t12≃30min
plz note that
Remember that in first order reaction, the rate of reaction is influenced by all the reactants but in pseudo first order reaction, the rate of the reaction depends only on the isolated reactant.
When a second order reaction is intentionally made to behave like a first order reaction, then it is called a Pseudo first order reaction. This reaction takes place when one of the reacting components is kept constant or present in great extent compared to the other