A) 4g
B) 8g
C) 16g
D) 2g
Correct Answer: A
Solution :
\[{{\text{t}}_{1/2}}=6\,\min \] \[{{N}_{0}}=32\,g\] \[\text{Total}\,\text{time}\,\text{=}\,\text{18}\,\text{min}\] \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\] \[n=\frac{\text{Total}\,\text{time}}{\text{Half}-\text{life}}=\frac{18}{6}3\] \[\frac{N}{32}={{\left( \frac{1}{2} \right)}^{3}}\] \[\frac{N}{32}=\frac{1}{8}\] \[N=\frac{32}{8}=4\,g\]
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