Question

Calculate the no of atoms and the no of molecules in 11.2lt of oxygen at nth

Answer 1

HELLO THERE!

What is the number of atoms and number of molecules in 11.2 litres of oxygen gas at STP?

Note: 1 molecule of oxygen contains 2 oxygen atoms (O + O = O₂).
1 mole of oxygen gas contains 22.4 litres of Oxygen at STP.

Avogadro's constant = 6.023 x 10²³
[Here, for simplicity in calculations, you can take it as 6 x 10²³].



Hence, from the above data, 

In 22.4 litres of oxygen, there are 6 x 10²³ molecules.

∴ In 11.2 litres of oxygen, there are:

$\frac{6 \times 10^{23} \times 11.2 }{22.4}$
molecules


On calculation, you get the value = 3 x 10²³ molecules.




Now, 1 molecule of Oxygen contains 2 atoms,

So, 3 x 10²³ molecules will contain 2 x 3 x 10²³ atoms
= 6 x 10²³ atoms



HOPE MY ANSWER IS SATISFACTORY.....
Thanks!

Answer 2

 1 molecule of oxygen contains 2 oxygen atoms (O + O = O₂).
1 mole of oxygen gas contains 22.4 litres of Oxygen at STP.

Avogadro's constant = 6.023 x 10²³
In 22.4 litres of oxygen, there are 6 x 10²³ molecules.
 In 11.2 litres of oxygen, there are
\frac{6 \times 10^{23} \times 11.2 }{22.4}​22.4​​6×10​23​​×11.2​​ 
molecules
value = 3 x 10²³ molecules.