how many sulfur atoms in 3.5 moles of S8 molecules. Please help me!
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A mole of molecules is Avogadro's number of molecules, and each molecule has 8 sulfur atoms, so multiply
(3.5 moles)(6.022 x 10^23 molecules per mole)(8 atoms per molecule)
(3.5 moles)(6.022 x 10^23 molecules per mole)(8 atoms per molecule)
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Simon answered it correctly for you the first time you posted it. Go back and take a look. The answer is indeed 1.7x10^25 atoms of sulfur ... to two significant digits.