Myah T.

asked • 03/29/20

How many milligrams of calcium is in 1.28-g of calcium carbonate?

How many milligrams of calcium is in 1.28-g of calcium carbonate?

1 Expert Answer

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Martin S. answered • 03/29/20

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First determine the fraction of calcium carbonate that is calcium, then multiply this fraction by the mass of the sample.


Atomic weight of calcium equals 40.08

Molecular weight of calcium carbonate equals 100.09

So calcium is 40.08 / 100.09 of the sample, or 0.25


Now multiply that by the mass of the sample, 1.28 x 0.25 = 0.32, or 320 milligrams

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