You won't learn how to do it with me doing the work for you.
Substitute the numbers into the equations I've written (and post your ork) until you get stuck, then post what you don't understand about the next step. I shall be happy to help you through it. Help is the key word here.
How many atoms of mercury are present in 5.4 cubic cm of liquid mercury? The density of mercury is 13.55g/cc.
mass Hg = volume x density
Then convert to moles.
Then remember there are 6.022E23 atoms for every mole.
I still don't get how to do this! HELP ME!!!
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