Question

The activation energy of a chemical reaction can be determined by :

• A. evaluating rate constants at two different temperatures
• B. changing the concentration of reactants
• C. evaluating the concentration of reactants at two different temperatures
• D. evaluating rate constant at standard temperature

Answer 1

Answer: (A)

evaluating rate constants at two different temperatures

Activation energy can be determined by evaluation rate constants at different temperatures using equation:

$ln\frac{K_2}{K_1}=\frac{E_a}{R}(\frac{1}{T_1}-\frac{1}{T_2})$

Where, $K_2=$ rate constant at temperate $T_2$

$K_1=$ rate constant at temperate $T_1$