One aluminum atom has a diameter of 0.000000025 cmhow many atoms thick is the aluminum foil?
This is Avagadro's number, it is equal to one mole of a substanceYou solve for mass by taking atoms to moles and moles to grams using the molar mass.
You would have 1 molof Al, or the Atomic weight of the substance; in this case it would be 26.982g
just cancel your units in Dimensional analysisTake .495833 cm (1 atom/ .000000025 cm) the resulting answer is: 19,833,320 Al Atoms per sheet of foil or 1.983332 10^7
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