NEET 2003
- Exam
- NEET
- Year
- 2003
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
NEET 2003 · Chemistry · Chemical Kinetics
The radiosotope tritium ( _1^3 H) has a lalf life of 12.3 years. If...
The radiosotope tritium has a lalf life of 12.3 years. If the initial amount of tritium is , how many milligrams of it would remain after 49.2 years
Options
- A
- B
- C
- D
Correct answer
B.
Step-by-step solution
\begin{aligned}\mathrm{T}& =\mathrm{t}^{1 / 2} \times n \\
n & =\frac{49.2}{12.3}= 4 \\
\mathrm{ N}& = \mathrm{N} }_{0}(1 / 2)^n \\
& =32(1 / 2)^4 \\
& =2 \mathrm{mg}
\end{aligned}