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What is the percent by mass of a sample of ocean water that is found to contain 1.3 grams of magnesium ions per 1000.0g?

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Percentage of Magnesium by mass

= (mass of magnesium)/(mass of ocean water)`xx100%`

`= 1.3/1000xx100%`

`= 0.13%`

 

So the percentage mass of Magnesium in ocean water  is 0.13%.

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