Advertisements
Advertisements
Question
Answer the following in brief.
How instantaneous rate of reaction is determined?
Advertisements
Solution
i. To determine the instantaneous rate of a reaction the progress of a reaction is followed by measuring the concentrations of a reactant or product for different time intervals.
ii. The concentration of a reactant or a product is plotted against time.
iii. A tangent drawn to the curve at time t1 gives the rate of the reaction. The slope thus obtained gives the instantaneous rate of the reaction at time t1.
Determination of instantaneous rate
iv. Mathematically the instantaneous rate is expressed by replacing Δ by derivative dc/dt in the expression of the average rate.
Instantaneous rate = `("d"["C"])/"dt"`
v. For a reaction \[\ce{A → B}\]
Instantaneous rate of consumption of A at time t = `-("d"["A"])/"dt"`
Instantaneous rate of the formation of B at time t = `("d"["B"])/"dt"`
Therefore, instantaneous rate of the reaction at time t = `-("d"["A"])/"dt"` = `("d"["B"])/"dt"`
RELATED QUESTIONS
The rate of reaction for certain reaction is expressed as:
`1/3(d[A])/dt=-1/2(d[B])/dt=-(d[C])/dt`
The reaction is ______.
Answer the following in one or two sentences.
For the reaction,
\[\ce{N2_{(g)} + 3H2_{(g)} -> 2NH3_{(g)}}\],
what is the relationship among `("d"["N"_2])/"dt"`, `("d"["H"_2])/"dt"` and `("d"["NH"_3])/"dt"`?
Rate constant for the reaction \[\ce{2N2O5 -> 4NO2 + O2}\] is 4.98 × 10–4 s–1. Find the order of reaction?
For the reaction \[\ce{H2_{(g)} + I2_{(g)} ⇌ 2HI_{(g)}}\], the average rate of reaction is expressed as ____________.
For the reaction \[\ce{A + 2B -> C}\], the instantaneous rate of reaction at a given instant can be represented by ____________.
The rate of disappearance of SO2 in the reaction \[\ce{2SO2 + O2 -> 2SO3}\] is 1.28 × 10−3 mol dm−3 s−1. Then the rate of formation of SO3 is ____________ mol dm−3 s−1.
For the reaction \[\ce{N2 + 3H2 ⇌ 2NH3}\]; if `(∆["NH"_3])/(∆"t")` = 2 × 10−4 mol dm−3 s−1, the value of `(-Δ["N"_2])/(∆"t")` would be ____________.
What is the average rate of reaction when the change in concentration of product is 0.05 Min 20 seconds?
Average rate of reaction for the following reaction.
\[\ce{2SO2 (g) + O2(g) -> 2SO3 (g)}\] is written as ______.
What is the relation between `("d"["H"_2])/"dt" and ("d"["NH"_3])/"dt"`?
In the reaction A + 3B → 2C, the rate of formation of C is ______.
Define the rate of a reaction.
Explain the term instantaneous rate of a reaction.
Explain factors affecting the rate constant of a chemical reaction.
For the reaction, \[\ce{3I^-(aq) + S2O^2-_8(aq) -> I^-_3(aq) + 2SO^2-_4(aq)}\]
`(d[SO_4^(2-)])/dt = 2.2 xx 10^(-2)` M/s at a particular time.
Calculate `(a) -(d[I^-])/dt (b) -(d[S_2O_8^(2-)])/dt (c) (d[I_3^-])/dt`
The rate constant for a first order reaction is 0.58 s-1 at 300 K and 0.026 s-1 at 290 K. What is the energy of activation? (R = 8.314 J K-1 mol-1)
Which of the following equations is correct regarding rate of disappearance of reactant and appearance of product for
N2(g) + 3H2(g) → 2NH3(g)
For the reaction, \[\mathrm{N_{2(g)}+3H_{2(g)}\longrightarrow2NH_{3(g)}}\]
N2(g) disappears at a rate of 2×10-4mol dm-3 s-1. Calculate rate of disappearance of H2?
