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Q. What percentage of oxygen is present in the compound $CaCO_{3}\cdot3Ca_{3}\left(PO_{4}\right)_{2}$?

Some Basic Concepts of Chemistry

Solution:

% of $O = \frac{16\,\times\,27}{\left(100\,+\,3\,\times\,310\right)}\times100 = 41.94\%$