Question

Which of the following represent the expression for $5 / 6$ life of a first order reaction?

• A. $\frac{k}{2.303} \log \frac{6}{5}$
• B. $\frac{2.303}{k} \log \frac{5}{6}$
• C. $\frac{2.303}{k} \log 6$
• D. $\frac{2.303}{k} \log 5$

Answer 1

Answer: (C)

$t_{5 / 6}=\frac{2.303}{k} \log \frac{\left[R_{0}\right]}{\left[R_{0}\right] / 6}$
$\therefore t=\frac{2.303}{k} \log 6$