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"Enamel, the hard outer covering of a tooth, is composed of a network of calcium ions
(Ca?), phosphate ions (PO,'), and hydroxide ions (OH), called a hydroxyapatite.
The hydroxide ion in hydroxyapatite structure can be replaced by fluoride ions (F)
during the brushing of teeth; hence, fluoroapatite is produced.
a. If hydroxyapatite contains 38.39% Ca, 18.50% P, 41.41%0, and 0.20% H; :
and its molar mass is 1 004 g/mol, what is its molecular formula?
b. If fluoroapatite contains 39.68% Ca, 18.45% P. 38.10% 0, and 3.77% F:
and its molar mass is 1 008 g/mol, what is its molecular formula?"
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