Advertisements
Advertisements
Question
A first order reaction is 50% complete in 25 minutes. Calculate the time for 80% completion of the reaction.
Advertisements
Solution
`t_{1//2} = 25 ` minutes ⇒k = `0.693 /{25 "mins"}`
K = `2.303/25 = 2.303/tlog 100/{a_1} `
⇒ `0.693/25 = 2.303/t log 100/20` 80% completion
`t = 2.303/0.693 xx 25 xx 0.6990`
t = 57.3 mins
APPEARS IN
RELATED QUESTIONS
Time required to decompose SO2Cl2 to half of its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.
In a pseudo first order hydrolysis of ester in water, the following results were obtained:
| t/s | 0 | 30 | 60 | 90 |
| [A]/mol L−1 | 0.55 | 0.31 | 0.17 | 0.085 |
Calculate the average rate of reaction between the time interval 30 to 60 seconds.
The rate constant for a first order reaction is 60 s−1. How much time will it take to reduce the initial concentration of the reactant to its `1/16`th value?
For the decomposition of azoisopropane to hexane and nitrogen at 543 K, the following data are obtained.
| t (sec) | P(mm of Hg) |
| 0 | 35.0 |
| 360 | 54.0 |
| 720 | 63.0 |
Calculate the rate constant.
Define order of reaction. How does order of a reaction differ from molecularity for a complex reaction?
State a condition under which a bimolecular reaction is kinetically first order reaction.
A first order reaction is 50% complete in 20 minute What is rate constant?
The slope in the plot of `log ["R"]_0/(["R"])` Vs. time for a first-order reaction is ______.
Radioactive decay follows first-order kinetics. The initial amount of two radioactive elements X and Y is 1 gm each. What will be the ratio of X and Y after two days if their half-lives are 12 hours and 16 hours respectively?
The following data were obtained during the decomposition of SO2Cl2 at the constant volume. SO2Cl2 →SO2(g) + Cl2(g)
| Time (s) | Total Pressure (bar) |
| 0 | 0.5 |
| 100 | 0.6 |
Calculate the rate constant of the reaction.
