How many atoms are in 15.3 cm3 of mercury (at room temperature)

Question

aaronq · Answer

find mass..  density=mass/volume

find moles.. moles=mass/molar mass

multiply by avogadros number to find the number of atoms

anonymous · Answer

Density = mass/volume

you know the volume 15.3 cm^3 which equals 15.3 mL
find the density of mercury (on a chart) then find the mass

once you have the mass use n=m/MW (moles equals mass over molecular weight)

find the number of moles (n) and multiply that by avogadros number to find the amount of particles (in your case, atoms) present.

anonymous · Answer

It doesnt work. The density of Hg is 15.546 g/cm3, i.e. according to your calculation:

15.546 x 15.3 = 237.85
237.85 x 6.002*10 23 = 1.4 *10 26, and this comes up as wrong when I enter it :/ Do I make anything wrong here?

aaronq · Answer

you forgot to convert the grams 237.85 Hg to moles of Hg

anonymous · Answer

Oh yeh thats right, thanks!