Further explanation
Given
25 moles of Oxygen(02)
Required The number of molecules
Solution Reaction
2NO+02 → 2NO2
From the equation,
mol NO2: = 2/1 x mol O2 = 2/1 x 25moles = 50 moles
The number of molecules :
[tex] = 50 \times 6.022 \times 10^{23}[/tex]
[tex] = 3.011 \times 10{²5}[/tex]