A) 4.69 g
B) 46.8 g
C) 9.375 g
D) 93.75 g
Correct Answer: A
Solution :
Number of half-lives \[n=\frac{t}{{{t}_{1/2}}}=\frac{18h}{3h}=6\] Using the relation \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\] \[N=300\times {{\left( \frac{1}{2} \right)}^{6}}\] Hence, \[N=300\times \frac{1}{64}=4.69\,g\]
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