Question

Activation energy of a chemical reaction can be determined
by
(a) evaluating rate constant at standard temperature
(b) evaluating velocities of reaction at two different
temperatures
(c) evaluating rate constants at two different temperatures
(d) changing concentration of reactants

Answer 1

Explanation:

Activation energy of a chemical reaction can be determined

by

(c) evaluating rate constants at two different temperatures

Answer 2

Activation energy of a chemical reaction can be determined  by  evaluating rate constants at two different temperatures.

Explanation:

Activation energy

• The energy which provides in a nuclear or chemical system with reactants.
• It is measured in kilo calories per mole, joules.
• The energy barriers magnitude separates the minimum potential energy surface which pertains to beginning and ending state of thermodynamics.

K = A $e^ -Ea/RT$

Here Gas constant is R

Rate constant is k

Activation energy is Ea

Temperature T expressed in kelvin

Frequency factor A

㏑K = $\frac{-Ea}{RT}$ + ㏑A

Two different rate constant,

㏑$k{1}$ = $\frac{-Ea}{RT1} }$ + ㏑A

㏑$k{2}$ = $\frac{-Ea}{RT2} }$ + ㏑A

these two equations are subtracted

㏑$\frac{K{1} }{K{2} }$ = $\frac{Ea}{R}$[$\frac{1}{T{2} }$-$\frac{1}{T1} }$]

$Ea$ = $\frac{RT1T2}{T2 - T1}$ ㏑$\frac{K1}{K2}$

To learn more;

1. https://brainly.in/question/7826425
2. https://brainly.in/question/14749739