by 
Anonymous
ANSWERS: 5
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According to Wikipedia, it is 64.054 g/mol. Not sure how you figure that out, though.
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You google it. That's how. If step one is fruitless, you search Wikipedia. If that doesn't work, you probably invented some new field of science.
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Basic chemistry: The relative atomic mass of sulphur is 32,065(5) The relative atomic mass of oxigen is 15,999. Since from the atomic formula of the sulphur dioxide ( SO2 ) we can get 2 oxigen atoms, this is what we do: 32,065 ( from the sulphur ) + 2x 15,999 ( from the oxigen ) = 64, 063 g/mol
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Apart from wikipedia, and working it out from the molar mass of Sulfur and Oxygen, you can get an estimate by counting neutrons and protrons. Oxygen is eight of each = 16 Sulfur ... without looking it up I think sulfur is just below oxygen in the periodic table (eight squares further on). That would be eight more protons, but how many neutrons? I don't know. I'll guess at the same number of neutrons as protons: Result 32 from sulfur + 32 from two oxygen = 64. Pretty close to the correct answer.
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How to find the answer given in Wikipedia: The Molecular Mass of O2 is given as 15.9994 (note that this is per atom, so you have to double this value for 2 atoms of oxygen, or O2). The Molecular Mass of S is given as 32.06. The equation for this reaction is: S + O2 = SO2 (already balanced...nice, huh?) So, you can say that "the Molecular Mass of Sulfur" + "the Molecular mass of 2 atoms of Oxygen" = "the molecular mass of Sulfur Dioxide". Or: 32.06 + 2*15.9994 = mass of SO2 This equals 32.06 + 31.9988 = 64.0588. *another note: to get the wiki-answer 64.058, use 15.999 for the molecular mass of oxygen.
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