Calculate the mass percentage of different elements in calcium phosphate.

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Hint: The mass percentage is the mass of elements divided by the molar mass of the compound. Here, the given compound to us is calcium phosphate and its formula is $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$. We can find the molar mass and then divide the mass of each component by the total mass to get the answer.

To find the mass percentage of different elements in calcium phosphate we need to know the elements present in calcium phosphate and to know that we need to know the formula of calcium phosphate, which is $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$.
So, molar mass of $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$= ($3\times$atomic mass of calcium) + ($2\times$atomic mass of phosphorus) + ($8\times$atomic mass of oxygen)
Therefore, putting the values we get, molar mass of $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$= 120+62+128 = 310.
Therefore, the mass percentage of calcium in calcium phosphate = $\dfrac{120}{310}\times 100=38.71%$.
Similarly, the mass percentage of phosphorus in calcium phosphate = $\dfrac{62}{310}\times 100=20%$.
And the mass percentage of oxygen in calcium phosphate = $\dfrac{128}{310}\times 100=41.29%$.