Homework Answers
Using the combined arrhenius equation, the activation energy of the reaction is determined:
ln (k2 / k1) = Ea / R * (1 / T1 - 1 / T2)
ln (0.0054 / 0.0073) = Ea / 0.008314 * (1/353 - 1/343)
Ea = 30.35 kJ / mol is cleared
Using the same equation, the constant k is determined for 25 and 6 ° C:
ln (k3 / 0.0073) = 30.35 / 0.008314 * (1/353 - 1/298)
It clears k3 = 0.0011 h-1
k4 = 0.0005 h-1
The shelf-time is calculated:
t1 / 2 3 = ln2 / k3 = ln 2 / 0.0011 = 630 h
t1 / 2 4 = ln2 / 0.0005 = 1385 h
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