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A. An oxide of As consists of 75.5% As, what is its empirical formula?

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b. if the molecular weight of the oxide is 395.6 g/mol, what is its molecular formula?

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  1. At.wt of As=74.9

    75.5%0f 395.6=302.0

    302.0/74.9=4

    O is 24.5% in 395.6 =98.0

    98.0/16                     =6

    so imperical formula is As4O6

    dividing by simplest number2

    it is                    = As2O3

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