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)

$t_{5/6}=\frac{2.303}{k}\log \frac{\left[R_0\right]}{\left[R_0\right]/6}$
$\therefore t=\frac{2.303}{k}\log 6$