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The mass of phosphorus of any sample of calcium phosphate is the mass of the same multiplied by the percentage that phosphorus makes up of that sample.

(mass of sample) x (mass of phosphorus/total mass)

Therefore we must look at the chemical formula of the substance in question: Ca3(PO4)2. From this we can see that there are 2 phosphorus atoms attributing mass to the total molecule. The formula becomes:

500 g x 2x30.97 g/mol/310.17 g/mol = 99.8 g

molar mass of phosphorus: 30.97 g/mol

molar mass of calcium phosphate: 310.17 g/mol

total mass: 500 g

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9y ago

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Anonymous

4y ago
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Q: How many grams of phosphorus are in 500 grams of calcium phosphate?
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