One mole of
contains three times as many sulfur atoms.
3 X =
atoms of sulfur.
3.42 grams of
must be converted to moles first,
(divide by its formula mass (342 atomic mass units)).
3.42 grams/342 atomic mass units
So! the number of mole of aluminium atoms is 3 X 0.01 =0.03mole.
So the number of atoms of aluminium is
0.03 X =
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Al = 27, S =32, O=16