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Question

Calculate the mass percent of calcium,phosphorus and oxygen in calcium phosphate Ca3(PO4)2

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Solution

Determining mass of calcium phosphate, calcium, phosphorus and oxygen

Molar mass of Ca3(PO4)2=(340)+(312)+(168)=310 g/mol

Molar mass of Calcium(Ca) = 40 g/mol
Molar mass of phosphorus(P) = 31 g/mol
Molar mass of Oxygen(O) = 16 g/mol

Calculating mass percent for Ca, P and O

Total mass of calcium present in 1 mole of Ca3(PO4)2=3×40=120g

Total mass of Phosphorus present in 1 mole of Ca3(PO4)2=2×31=62g

Total mass of Oxygen present in 1 mole of Ca3(PO4)2=8×16=128g

Mass percentage = Mass of component(g)Mass of Ca3(PO4)2 (g)×100

Mass percent of Ca = (120310)×100 = 38.71%

Mass percent of P = (62310)×100 = 20%

Mass percent of O = (128310)×100 = 41.29%

Hence, mass percent of calcium, phosphorus and oxygen in Ca3(PO4)2 are 38.71%, 20% and 41.29% respectively.






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