Collision theory and Activation Energy Temperature and Activation

Collision theory and Activation Energy

Temperature and Activation Energy

Temperature and in Ea

Arrhenius Equation

Arrhenius Equation You may also come across it in a different form created by a mathematical operation on the standard one: "ln" is a form of logarithm. Don't worry about what it means. If you need to use this equation, just find the "ln" button on your calculator.

2 N 2 O 5 (g)→ 4 NO 2 (g) + O 2 (g) -1 k (s ) 0. 000020 0. 000073 0. 000270 0. 000910 0. 002900 T (°C) 20 30 40 50 60

Finding Ea T (°C) T (K) 1/T (K) k (s-1) ln(k) 20 293 0. 003413 0. 000020 -10. 82 30 303 0. 0033 0. 000073 -9. 53 40 313 0. 003195 0. 000270 -8. 22 50 323 0. 003096 0. 000910 -7. 00 60 333 0. 003003 0. 002900 -5. 84

Ea = activation energy R = 8. 314 J/mol·K T = absolute temperature in Kelvins A = frequency factor

The Arrhenius equation is often written in the logarithmic form: A plot of lnk versus 1/T produces a straight line with the familiar form y = -mx + b, where x = 1/T y = lnk m=-E /R b = ln. A a Bestimmung von Ea The activation energy Ea can be determined from the slope m of this line: Ea = -m · R

Ea=-R(slope) • Slope =Δln(k)/Δ(1/T) • Ea=-(8. 3145 J/K*mol)(-12000 K) • =100, 000 J/mol