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Question

The mass percent of calcium, phosphorus and oxygen in calcium phosphate, $$Ca_{3}\left ( PO_{4} \right )_{2}$$ is :


A
Ca=38.71%, P=20.0%, O=41.29%
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B
Ca=20.0%, P=38.71%, O=41.29%
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C
Ca=38.71%, P=41.29%, O=20.0%
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D
Ca=41.29%, P=20.0%, O=38.71%
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Solution

The correct option is C $$Ca = 38.71\%$$, $$P = 20.0\%$$, $$O = 41.29\%$$
Molecular formula of calcium phosphate is $$Ca_{3}\left ( PO_{4} \right )_{2}$$.
Its molar mass is $$3 (40)+2(31)+8(16)=310$$ g/mol.
Percent of calcium $$=\dfrac {120} {310} \times 100 =38.71\%$$
Percent of phosphorus $$=\dfrac {62} {310} \times 100 =20.0\%$$
Percent of oxygen $$=\dfrac {128} {310} \times 100 =41.29\%$$

Chemistry

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