Question

Milk turns sour at ${40}^{0}C$ three times as faster as at $0^{0}C$. The energy of activation for souring of milk is:

• A. 4.693 kcal
• B. 2.6 kcal
• C. 6.6 kcal
• D. none of these

Answer 1

The correct option is A 4.693 kcal

$log\frac{k_2}{k_1}=\frac{E_a}{2.303\times R}(\frac{1}{T_1}-\frac{1}{T_2})$

Milk turns sour at 313 K 3 times as faster as at 273 K.Substituting the values

$log13=\frac{E_a}{2.303\times 2}(\frac{1}{313}-\frac{1}{273})$

$E_a=4.693kcal$