After four half-lives of a radioactive substance, you have 2.0 g left. How much material did you start with?

2.0 g

8.0 g

16.0 g

32.0 g

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

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water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.