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How many atoms are present in one formula unit of calcium hydrogen carbonate Ca(HCO3)2?

Could someone explain to me why the answer is 11? Thank you.

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It has 1 Calcium atom (Ca), 2 Hydrogen atoms (H), 2 carbon atoms (C) and 6 Oxygen atoms (O). Adding all you get 11.

11×6.02×10^23

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