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If 3.1gm Phospherous is present in a sam...

If 3.1gm Phospherous is present in a sample of `Ca_(3)(PO_(4))_(2)` the what is the weight of oxygen in the sample?

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Mol. Wt of `Ca_(3)(PO_(4))_(2)` =310 gms.
It contains 62g of phasphorus
`:.` wt. of `Ca_(3)(PO_(4))_(2)` that contains 3.1 g of phosphorous `=(3.1xx310)/(62)`=15.5gm.
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