Question

Calculate the number of oxygen atoms in $0.2$ mole of $N{a_2}C{O_3} \cdot 10{H_2}O$ .

Answer 1

Sodium carbonate $N{a_2}C{O_3} \cdot 10{H_2}O$ , is a inorganic compound with the formula $N{a_2}C{O_3}$ and its various hydrates. It is also known as washing soda, soda ash, and soda crystals. All of the forms are water-soluble, white, odourless salts that produce moderately alkaline solutions in water.

Complete answer:
Oxygen is the chemical element with the atomic number $8$ and the symbol $O$ . It is a highly reactive nonmetal and an oxidising agent that readily forms oxides with most elements and other compounds. It belongs to the chalcogen group in the periodic table.
Here, we can find that $N{a_2}C{O_3} \cdot 10{H_2}O$ contains $13$ moles of oxygen, $O$ atoms.
That is, the number of moles of $O$ atoms in $1$ mole of $N{a_2}C{O_3} \cdot 10{H_2}O = 13$
So, the number of moles of $O$ atoms in $0.2$ mole of $N{a_2}C{O_3} \cdot 10{H_2}O = 13 \times 0.2 = 2.6$
It is familiar that, $1$ mole of a substance contains $6.022 \times {10^{23}}$ particles of the substance.
Therefore, the number of moles of $O$ atoms in $2.6$ mole of oxygen $= 2.6 \times 6.022 \times {10^{23}} = 15.66 \times {10^{23}}$
Hence, there are $15.66 \times {10^{23}}$ atoms of oxygen in $0.2$ mole of $N{a_2}C{O_3} \cdot 10{H_2}O$
So, the answer is $15.66 \times {10^{23}}$ atoms.

Additional Information:
The following are some of the most popular uses for sodium carbonate also known as washing soda:
It is a cleaning agent that is used in the home for things like laundry. Many dry soap powders contain sodium carbonate as an ingredient.
It is used to remove both temporary and permanent water hardness.
It is used to make glass, soap, and paper, among other things.
It is used in the production of sodium compounds such as borax.

Note:
Sodium carbonate is a water-soluble mineral that can be found in arid environments, especially in mineral deposits created when seasonal lakes evaporate. Extraterrestrial sodium carbonate is unusual.