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Sulphur trioxide may be prepared by the ...

Sulphur trioxide may be prepared by the following two reactions :
`S_(8) + 8O_(2)(g) to 8SO_(2)`(g)
`2SO_(2)(g) + O_(2) to 2SO_(3)`(g)
How many grams of `SO_(3)` will be produced from 1 mol of `S_(8)` ?

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