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hejå
How many atoms are in 15.3 cm3 of mercury (at room temperature)?
you will need to know the density of mercury, as well as the molar mass, and the number of atoms that make up a mole
and how do you put them together eg density * mass +atmon? or what
set up conversion fractions to cancel units and replace them with better ones:\[(\frac{15.3cm^3 Hg}{1}) * (\frac{g Hg}{cm^3 Hg})*(\frac{molHg}{g Hg})*(\frac{atoms Hg}{mol Hg})\] plug in the numbers, and all the units except the atoms of Hg will cancel. It better be huge, because there are a lot of atoms in 15.3cm3 of Hg