Advertisements
Advertisements
Question
The decomposition of a hydrocarbon has value of rate constant as 2.5×104s-1 At 27° what temperature would rate constant be 7.5×104 × 3 s-1if energy of activation is 19.147 × 103 J mol-1 ?
Advertisements
Solution
log `K_2/K_1= Ea /(2.303 R) [(T_2 - T_1)/(T_1T_2)]`
`T_1 -> 300k-> 2.5 xx 10^4 s^-2 → K_2`
`T_1 -> 300k-> 2.5 xx 10^4 s^-2 → K_2`
log `(7.5xx10^4(T-300))/(19.15 (300T))`
⇒ `0.477/1000 xx 300T = (T-300)1000`
⇒ 143T = 1000T - 300000
⇒ 300000 = 1000T - 143T
= 857 T
`T = 300000/857 = 350 K`
APPEARS IN
RELATED QUESTIONS
The rate constant of a first order reaction increases from 4 × 10−2 to 8 × 10−2 when the temperature changes from 27°C to 37°C. Calculate the energy of activation (Ea). (log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
Consider figure and mark the correct option.
Which of the following graphs represents exothermic reaction?
(a)
(b)
(c)
During decomposition of an activated complex:
(i) energy is always released
(ii) energy is always absorbed
(iii) energy does not change
(iv) reactants may be formed
Which of the following statements are in accordance with the Arrhenius equation?
(i) Rate of a reaction increases with increase in temperature.
(ii) Rate of a reaction increases with decrease in activation energy.
(iii) Rate constant decreases exponentially with increase in temperature.
(iv) Rate of reaction decreases with decrease in activation energy.
Mark the incorrect statements:
(i) Catalyst provides an alternative pathway to reaction mechanism.
(ii) Catalyst raises the activation energy.
(iii) Catalyst lowers the activation energy.
(iv) Catalyst alters enthalpy change of the reaction.
For an endothermic reaction energy of activation is Ea and enthalpy of reaction ΔH (both of there in KJ moI–1) minimum value of Ea will be ______.
The slope of Arrhenius Plot `("In" "k" "v"//"s" 1/"T")` of first-order reaction is −5 × 103 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R = 8.314 JK−1mol−1]
Explain how and why will the rate of reaction for a given reaction be affected when the temperature at which the reaction was taking place is decreased.
A schematic plot of ln Keq versus inverse of temperature for a reaction is shown below
The reaction must be:
