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OpenStudy (anonymous):

WO3+3H2-->W+3H2O...How many grams of tungsten trioxide must you start with to prepare 5.10g of tungsten? MW=231.8 amu

OpenStudy (anonymous):

6.43g. Tungsten is 183.84g/mol. 5.10g W / 183.84 g x mol = about .02774 mol. 1 mol of Tungsten trioxide makes i mol of tungsten, atomic weight of WO3 is 231.84 g/mol, multiply that by 0.02774 mol = 6.43g with significant digits.

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