SOLUTION: The container held the compound (As) sub four O sub 6 and What was the percentage by weight of the Arsenic in this compound (As, 75;O,16)

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Question 1033113: The container held the compound (As) sub four O sub 6
and What was the percentage by weight of the Arsenic in this compound (As, 75;O,16)
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
The formula of the compound is As%5B4%5DO%5B6%5D , meaning that a molecule or formula unit comprises 4 atoms of As , and 6 atoms of O .
The mass of the 4 atoms of As ,
each with a mass of 75 atomic mass units, adds up to
4%2A75=300 .
The mass of the 6 atoms of O ,
each with a mass of 16 atomic mass units, adds up to
6%2A16=96 .
The total mass of the molecule is 300%2B96=396 atomic mass units,
and out of that total, the mass of the arsenic is
300 atomic mass units.
As a fraction, that is
300%2F396=about0.76=about76%2F100=about76%25 (rounding to whole numbers, or 2 significant figures, as a chemistry teacher might say).