Chem ! using the average atomic mass, calculate the number of atoms present in 1.2 ml of liquid mercury. (density=13.6g/ml)

So let's convert this amount of mL to grams:

Then we need to convert to moles using the molar weight found on the periodic table for mercury (Hg):

Then we need to convert moles to atoms using Avogadro's number:

So now we know that in 1.2 mL of liquid mercury, there are present.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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