Question

Calculate the number of oxygen atoms in 0.2 mole of Na2CO3.10H2O.

Answer 1

Hi,
Na2CO3.10H2O, one mole of it contains 13 moles of oxygen atoms. Hence

Number of moles of oxygen atoms in one mole of Na2CO3.10H2O = 13

number of moles of oxygen atoms in 0.2 moles of Na2CO3.10H2O = 13 X 0.2 = 2.6

Now, one mole of a substance contains 6.022 X 1023 particles of the substance. Thus

number of atoms of oxygen in one mole of oxygen atom = 6.022 X 1023

number of moles of oxygen atoms in 2.6 moles of oxygen atoms = 2.6 X 6.022 X 1023 = 15.657 X 1023

= 1.566 X 1024

Thus, there are 1.566 X 1024 atoms of oxygen in 0.2 moles of Na2CO3.10H2O.

Answer 2

Answer:

0.2 moles of Na2CO3.10H2O contains 15.657×10²³ of oxygen atoms.

Explanation:

As one mole of hydrated sodium bicarbonate (Na2CO3.10H20) contains a total of 13 oxygen atoms.

So, 0.2 mole of Na2CO3.10H2O contains  13 × 0.2= 2.6 moles of Oxygen atom.

Since 1 mole of oxygen atom has 6.022×10²³ particles. Therefore,

2.6 mole of Oxygen atom has 2.6×6.022×10²³= 15.657 × 10²³

#SPJ3