Question

how many atoms are present in a mole of ca(hco3)2​

Answer 1

Answer:

11

Explanation:

It has 1 Calcium atom (Ca), 2 Hydrogen atoms (H), 2 carbon atoms (C) and 6 (2*3)Oxygen atoms (O)

the 2 outside the bracket implies for everything in it.

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Answer 2

Answer:

$5N_{a} = 5 * 6.02 * 10^{23} atoms$

Explanation:

Calcium Hydroxide has three atoms 5 atoms in each molecule.

   One calcium atom

   Two oxygen atoms

   Two hydrogen atoms

So total 5NA​ atoms are present in NA​ molecules.

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