Question

The thermal decomposition of a compound is of the first order. If 50% of the sample is decomposed in 30 minutes, how long will it take for 99.9% of the compound to decompose.

• A. 150 minutes
• B. 300 minutes
• C. 600 minutes
• D. 270 minutes

Answer 1

The correct option is B 300 minutes

$t_{99.9\%}=10\times t_{\frac{1}{2}}=10\times 30=300minutes$