Question

The activation energy of the souring of milk is: $\left(kJmo{l}^{-1}\right)$

• A. $30.210$
• B. $30.146$
• C. $30.0$
• D. $35.126$

Answer 1

The correct option is B $30.146$

At $2^{\circ }C\left(275K\right)$. the reaction is three times slower than at ${27}^{\circ }C\left(300K\right)$. This implies that for souring of milk.
$\frac{k_{300}}{k_{275}}=3,T,=275K,T_2=300K$
Applying Arrhenius equation
$log\frac{k_{300}}{k_{275}}=\frac{E_a}{2.303\times 8.314}\left(\frac{300-275}{275\times 300}\right)$
or $E_a=30.146kJmo{l}^{-1}$