Question

A first order reaction which is 30% complete in 30 minutes has a half-life period of.

• A. 24.2 min
• B. 58.2 min
• C. 102.2 min
• D. 120.2 min

Answer 1

Answer: (B)

58.2 min

Answer 2

$k = \frac{2.303}{t}\log\frac{a}{a - x}$

$\frac{0.693}{T} = \frac{2.303}{t}\log\frac{100}{100 - 30}$

$\therefore T = 58.2$min.