That is exactly 8 half lives. After 8 half - lives only (1 / 2^8) or (1 / 256) of the original 30 grams will remain. (1 / 256) =
<span>
<span>
<span>
0.003906250
</span>
</span>
</span>
So, 30 * <span>
<span>
0.003906250 = </span></span>
<span>
<span>
<span>
0.1171875 grams will remain. </span></span></span>
