The chemical formula of hydroxyapatite is Ca 10 (PO 4) 6 (OH) 2, which can be used for bone replacement, plastic surgery, dentistry and calcium supplementation.

(1) 1 hydroxyapatite contains 10 calcium atoms, 6 phosphorus atoms, 26 oxygen atoms and 2 hydrogen atoms, so the atomic number ratio of Ca, P, O and H in hydroxyapatite is10: 6: 26: 2 = 5: 3.

(2) The mass ratio of O and H in hydroxyapatite is (16× 26): (1× 2) = 208:1.

(3) The mass fraction of calcium in hydroxyapatite is 40×101004×100% ≈ 39.8%.

So the answer is: (1) 5: 3:13:1; (2)208: 1; (3)39.8%.

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