Activation energy

IIT JEE Questions › Physical Chemistry questions › Activation energy

A catalyst decreases the activation energy of the rxn
Aâ†’B (reversible)
by 2%. Î”H = 37.02 Kcal. At 300 K, 4*10^-8% molecules of B are able to cross over the potential energy barrier in absence of catalyst. How many times the catalyst will increase the rate of forward reaction at 300 K??

#Chemistry #Physical Chemistry

UP 0 DOWN 0 1 6
Post on FacebookPost anonymously?

6 Answers

1

injun joe ·2009-08-13 04:07:38

Any1?

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

gagar.iitk ·2009-08-16 02:21:02

find activation energy for backward direction by fraction of activated molecules......then find it for forward reaction with the help of Î”H then find the activation energy after catalyst is used ( 2%) then the K after catalyst is used then Rate is directly proportional to k from here u can find ur ans
go step by step plz

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

gagar.iitk ·2009-08-16 07:00:01

e^-e_a/rt=fraction of activated molecules =4x10^-10
now try it

UP 0 DOWN 0
Post on FacebookPost anonymously?

24

eureka123 ·2009-08-16 07:00:56

okkk..trying..

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

injun joe ·2009-09-03 06:17:04

Got it!!

UP 0 DOWN 0
Post on FacebookPost anonymously?

11

mona100 ·2009-09-03 10:46:34

What is the answer??

UP 0 DOWN 0
Post on FacebookPost anonymously?

Your Answer

Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω