Advertisements
Advertisements
Questions
What is the rate constant?
What do you understand by rate constant?
What is meant by the rate constant of a reaction?
Advertisements
Solution 1
When the concentration (active mass) of each reactant is at unity, the rate constant of a chemical reaction equals the rate of the reaction.
∵ Rate of reaction ∝ [Reactant]
If A → product, then
rate (R) = k[A]
If [A] = 1, then rate, R = k,
where k is the rate constant.
Solution 2
- The rate constant of a reaction is equal to the rate of reaction when the concentration of each of the reactants is unity.
- At a specific temperature, a reaction's rate constant has a fixed value. As the temperature rises, so does its worth. It is independent of the reactant concentrations at the initiation.
APPEARS IN
RELATED QUESTIONS
Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t1/2 = 3 hours. What fraction of the sample of sucrose remains after 8 hours?
The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume.
\[\ce{SO2Cl2_{(g)} -> SO2_{(g)} + Cl2_{(g)}}\]
| Experiment | Time/s–1 | Total pressure/atm |
| 1 | 0 | 0.5 |
| 2 | 100 | 0.6 |
Calculate the rate of the reaction when total pressure is 0.65 atm.
In the presence of acid, the initial concentration of cane sugar was reduced from 0.2 M to 0.1 Min 5 hours and to 0.05 Min 10 hours. The reaction must be of?
First order reaction is 50% complete in 1.26 × 1014s. How much time could it take for 100% completion?
Time required to decompose SO2Cl2 to half of its initial concentration is 60 minutes. If the de-composite is a first order reaction, calculated the rate constant of the reaction-
The decomposition of formic acid on gold surface follows first-order kinetics. If the rate constant at 300 K is 1.0 × 10−3 s−1 and the activation energy Ea = 11.488 kJ mol−1, the rate constant at 200 K is ______ × 10−5 s−1. (Round off to the Nearest Integer)
(Given R = 8.314 J mol−1 K−1)
The slope in the plot of ln[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?
Show that `t_(1/2)= 0.693/k` for first reaction.
Write the unit of rate constant [k] for the first order reaction.
