Determine the number of atoms in 1.70 ml of mercury. (the density of mercury is 13.5 g/ml.)

To determine the number of atoms in 1.70ml of mercury, we have to determine the moles of mercury.

First find the mass in grams by using the formula:

Mass = volume x density

(1.70 mL Hg) x (13.5 g/mL) = 22.95 g Hg 

Now find number of moles;

(22.95 g Hg) x (1 mol Hg/200.59 g/mol) = 0.1144 mol Hg 

For number of atoms multiply with Avogardro's number that is 6.023 x 10²³

(0.1144 mol Hg) x (6.023 x 10²³ atoms/mol) = 6.89 x 10²² atoms Hg 

So, there is 6.89 x 10²² atoms of mercury are present in 1.70ml of mercury.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

the answers would be

the first one and the second one