Question

No of atoms in 10L of ammonia

Answer 1

One mole of any gas occupies about 22.4 litres of space at STP. 
Also, I mole contains Avogadro's number of molecules.
So, one mole of NH3 occupies 22.4 litres and has 6.022 × 10^23 molecules. 
Therefore 1 litre contains 1 ÷ 22.4 moles.
Thus: 
10 litres contain 10 ÷ 22.4 moles.
Therefore :
10 litres contain about 0.446 moles of NH3. 
Now for number of molecules: 
1 mole of NH3 contains 6.022 × 10^23 molecules.
Thus 0.446 moles of NH3 contain 6.022 × 10^23 × 0.446 molecules 
= 2.6851 × 10^23 molecules. 
Multiply by 4 for number of atoms. 
This gives final answer:
2.6851 × 4 × 10^23 ATOMS.




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