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Topic: How do you calculate the percentage by mass of oxygen in a compound ?  (Read 5346 times)

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Offline OneHeartAtATime

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How do you calculate the percentage by mass of oxygen in a compound ?
« on: August 10, 2009, 12:35:17 PM »
In any given compound, how would you calculate the percentage by mass of oxygen ?
For example :
 Sodium Sulfate


I know this is very elementary, but it has simply slipped my mind because I have not had to do it in a while. My apologies.
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Offline sjb

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Re: How do you calculate the percentage by mass of oxygen in a compound ?
« Reply #1 on: August 10, 2009, 01:01:54 PM »
What is the mass of, e.g. 1 mol of sodium sulfate? What is the formula unit for this? How much oxygen is there per ion pair?
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