A first-order reaction has a rate constant of 7.5 × 10-3/s. The time required for the reaction to be 60% complete is
3.8 × 10-3 s |
||
6.9 × 10-3 s |
||
68 s |
||
120 s |
||
130 s |
for a 1st order reaction -dA/dt= K[A], where K is rate constant and [A]= concentration of reactant
when integrated noting that at t=0 [A]=[A]o and at t=t, [A] =[A
lnA= lnAO-Kt (1)
but conversion XA= 1- [A]/[A]o
hence equation 1 in terms of XA becomes -ln(1-XA)= Kt
given XA=0.6, -ln(1-0.6)= 7.5*10-3*t, t= 122 seconds ( D is correct)
A first-order reaction has a rate constant of 7.5 × 10-3/s. The time required for the...
A first-order reaction has a rate constant of 3.51 ´ 10-3 s -1. The time required for the reaction to be 63% complete is?
A first order reaction has a rate constant of 1.85*10^3 s^-1 at 25 C. The rate constant for this same reaction is 4.14*10^4 s^-1 at 100 C. What is the activation energy for this reaction
A certain first-order reaction (A products) has a rate constant of 5.40 10-3 s I at 45 °C How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? at 27 °C A certain second-order reaction (B-products) has a rate constant of 1.05x10-3 M 1.s and an initial half-life of 266 s What is the concentration of the reactant B after one half-life?
Part A) A certain first-order reaction has a rate constant of 2.40×10−2 s−1 at 25 ∘C. What is the value of k at 60 ∘C if Ea = 74.0 kJ/mol ? Express your answer using two significant figures. Part B) Another first-order reaction also has a rate constant of 2.40×10−2 s−1 at 25 ∘C. What is the value of k at 60 ∘C if Ea = 135 kJ/mol ? Express your answer using two significant figures.
Part A. A certain first-order reaction (A→products) has a rate constant of 3.90×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? Part B. A certain second-order reaction (B→products) has a rate constant of 1.90×10−3 M−1⋅s−1 at 27 ∘C and an initial half-life of 298 s . What is the concentration of the reactant B after one half-life?
A first-order reaction has a rate constant at 20 C of 2.75
10–2 sec-1 and Ea is 75.5 kJ/mol. What is the rate constant (in
sec-1) at 60C?
8. A first-order reaction has a rate constant at 20°C of 2.75 x 10 sec ? and Es is 75.5 kJ/mol. What is the rate constant (in sec ) at 60°C?
A decomposition reaction in first order in A. If the rate constant of the reaction is 3.85 x 10-2s-1, how long will it take for 68% of the material to decompose?
A certain first-order reaction (A→products) has a rate constant of 5.70×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
A certain first-order reaction (A?products) has a rate constant of 5.70×10?3 s?1 at 45 ?C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?
At a given temperature, a first order reaction has a rate constant of 2.8 x 10-51. The time required for the reaction to be 27% completed is: a) 19 min b) 7.7 min c) 1.8 min Od) 25 min e) 0.81 min