Question

A reaction proceeds by first order, 75% of this reaction was completed in 32 min. The time required for 50% completion is

• A. 8 min
• B. 16 min
• C. 20 min
• D. 24 min

Answer 1

Answer: (B)

16 min

$t=\frac{2.303}{0.0433}log\frac{100}{100-50}$

$t=53.18\times log2=15.95\approx 16$ min.